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Title: 营销反欺诈全流程 · Issue #6 · aialgorithm/Blog · GitHub

Open Graph Title: 营销反欺诈全流程 · Issue #6 · aialgorithm/Blog

X Title: 营销反欺诈全流程 · Issue #6 · aialgorithm/Blog

Description: 1 欺诈定义 欺诈是用户主观、以非法占有为目的,采用虚构事实或隐瞒事实真相的方法,骗取他人财物或金融机构信用,破坏金融管理秩序的行为。 按照欺诈的人数来分可分为:个体欺诈和团伙欺诈; 按照欺诈的主体来可分为第一、第二、第三方欺诈; 按照欺诈的行为可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类。按照欺诈的行为,大的方向上可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类,如果进一步 细分落到具体的场景上有:盗刷、薅羊毛、骗贷、套现、刷单、 刷好评等行为,根据不...

Open Graph Description: 1 欺诈定义 欺诈是用户主观、以非法占有为目的,采用虚构事实或隐瞒事实真相的方法,骗取他人财物或金融机构信用,破坏金融管理秩序的行为。 按照欺诈的人数来分可分为:个体欺诈和团伙欺诈; 按照欺诈的主体来可分为第一、第二、第三方欺诈; 按照欺诈的行为可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类。按照欺诈的行为,大的方向上可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类,如果进一步...

X Description: 1 欺诈定义 欺诈是用户主观、以非法占有为目的,采用虚构事实或隐瞒事实真相的方法,骗取他人财物或金融机构信用,破坏金融管理秩序的行为。 按照欺诈的人数来分可分为:个体欺诈和团伙欺诈; 按照欺诈的主体来可分为第一、第二、第三方欺诈; 按照欺诈的行为可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类。按照欺诈的行为,大的方向上可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类,如果进一步...

Opengraph URL: https://github.com/aialgorithm/Blog/issues/6

X: @github

direct link

Domain: github.com


Hey, it has json ld scripts:
{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"营销反欺诈全流程","articleBody":"## 1   欺诈定义\r\n欺诈是用户主观、以非法占有为目的,采用虚构事实或隐瞒事实真相的方法,骗取他人财物或金融机构信用,破坏金融管理秩序的行为。\r\n- 按照欺诈的人数来分可分为:个体欺诈和团伙欺诈;\r\n\r\n- 按照欺诈的主体来可分为第一、第二、第三方欺诈;\r\n\r\n- 按照欺诈的行为可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类。按照欺诈的行为,大的方向上可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类,如果进一步\r\n细分落到具体的场景上有:盗刷、薅羊毛、骗贷、套现、刷单、 刷好评等行为,根据不同的欺诈场景的应对方法是有所不同的。\r\n![](https://upload-images.jianshu.io/upload_images/11682271-4ee2b427e5ff2e8a.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n\r\n## 2  项目背景\r\n营销欺诈是互联网业务欺诈大类的一种,指的是羊毛党通过虚假身份参加营销活动大量获利的行为。据统计,存在1000万+被滥用身份信息、 200万+网络黑产从业者、超千亿黑产市场规模。“羊毛党”也逐渐从分散个体向组团集聚发展,形成了有组织、有规模、有分工的职业“羊毛党”。\r\n\r\n![](https://upload-images.jianshu.io/upload_images/11682271-9233cb2a09250e4e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n在此背景下,为避免营销资源浪费,在加强活动规则设计的同时,亟需运用技术手段搭建营销反欺诈系统,以保护良好营销环境,提升营销效果。\r\n\r\n## 3   方案设计\r\n模型层面主要应用的技术有:有监督分类模型、知识图谱无监督模型、业务策略。由于欺诈形式大都是未知、复杂多样的,本方案通过数据分析及无监督检测的方式对有监督模型做补充。\r\n![](https://upload-images.jianshu.io/upload_images/11682271-c6d8d6df498b7266.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n\r\n\r\n## 4   欺诈分析:\r\n在复杂的欺诈任务上,无法仅凭仅有的少数欺诈标签建立一个良好的欺诈模型(更何况标签质量参差不齐的),知己知彼百战不殆,这需要去了解业务知识、欺诈链,并采用更合适的技术手段来识别欺诈。\r\n### 4.1  羊毛党主要类型\r\n第一类是个人纯手工进行薅羊毛的行为,这类行为往往因涉案金额和规模小,且在商家营销的允许范围内;\r\n第二类通过破解平台的后台接口建立虚假客户端进行薅羊毛(黑客类);\r\n第三类利用外挂程序将薅羊毛过程完全自动化;\r\n第四类是团伙羊毛党,通常是组织者组织团伙成员薅羊毛;(与信贷团伙不同的是,羊毛党的欺诈涉及单笔金额较小,但团伙规模较大,团伙的实际组成可能只有单个人/工作室。)\r\n\r\n现实中,羊毛党会结合第三、四类薅羊毛方式,并存在与平台、商家瓜分利益,发展趋势更具规模化、产业化,这个是营销反欺诈的主要目标。\r\n\r\n### 4.2 薅羊毛的产业链\r\n![](https://upload-images.jianshu.io/upload_images/11682271-b00ec7ebb1a1e417.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n![](https://upload-images.jianshu.io/upload_images/11682271-a7a5e5010d9b9f73.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n### 4.3 欺诈特征\r\n\r\n\r\n通过业务数据分析(以某银行营销活动数据为例),发现了一些羊毛党特点\r\n- **群控特点**:每笔交易额度一样;商家集中性;活动开展短时间内交易频次高;行为序列类似;大量失败交易等;\r\n\r\n- **团伙性特点**:团伙间有资金往来;共用设备、手机号码、IP、相似GPS等;\r\n\r\n- **资源端特点**:代理IP、伪造GPS、伪造设备号、冒用身份证,存在大量一对多情况;\r\n\r\n-  **兑换端特点** :集中电子券,白酒等硬通货;收货地址相似度高;\r\n\r\n对这些特点,主要有两种应用:\r\n1、可以加工出相关的强特征:比如活动短期内的优惠频次;\r\n2、采用比较合适的模型去识别欺诈:如交易额度一样且频次高可以使用策略去覆盖;行为序列类似可以先用表征学习然后聚类发现;收货地址相似度高可以用WMD算法匹配高频地址群;团伙特点可以用知识图谱去挖掘黑产团伙;\r\n\r\n## 5   建模过程\r\n![](https://upload-images.jianshu.io/upload_images/11682271-0185e4cfa89ea149.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n\r\n\r\n### 5.1  有监督模型\r\n![](https://upload-images.jianshu.io/upload_images/11682271-049b5492cee018e3.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n\r\n\r\n\r\n### 5.2  知识图谱无监督模型\r\n主要运用知识图谱社区发现,结合异常检测发现高可疑的团伙,方法如下:\r\n1、图谱构建:构建活动的知识图谱;\r\n![](https://upload-images.jianshu.io/upload_images/11682271-0ff5cd6dec586990.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n2、社区发现:先运行联通子图算法,在非孤立的子图内通过louvain社区发现算法挖掘团伙;\r\n![](https://upload-images.jianshu.io/upload_images/11682271-076bb20ee3922bf4.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n3、统计社区指标:如各团伙人数, 团伙人均参加活动次数,团伙内欺诈名单占比等指标;\r\n![](https://upload-images.jianshu.io/upload_images/11682271-fc4a3ffbeb9103d7.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n4、检测异常社区:社区指标通过(如log, 幂)转换近似成为高斯分布,高斯异常检测算法发现异常的团伙;\r\n![](https://upload-images.jianshu.io/upload_images/11682271-5b80f9a6b893def9.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n5、名单核实:业务人员调查核实异常团伙名单,并将核实后名单回馈有监督模型实时训练迭代优化;\r\n![](https://upload-images.jianshu.io/upload_images/11682271-7ef8b4bf6a0fbb64.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n-----------\r\n\r\n![](https://upload-images.jianshu.io/upload_images/11682271-2888956525d821e9.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)\r\n\r\n **欢迎微信关注公众号“算法进阶”**,这里定期推送机器学习、深度学习、金融科技等技术好文。欢迎一起学习交流进步!      ","author":{"url":"https://github.com/aialgorithm","@type":"Person","name":"aialgorithm"},"datePublished":"2021-01-18T03:17:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/6/Blog/issues/6"}

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og:image:alt1 欺诈定义 欺诈是用户主观、以非法占有为目的,采用虚构事实或隐瞒事实真相的方法,骗取他人财物或金融机构信用,破坏金融管理秩序的行为。 按照欺诈的人数来分可分为:个体欺诈和团伙欺诈; 按照欺诈的主体来可分为第一、第二、第三方欺诈; 按照欺诈的行为可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类。按照欺诈的行为,大的方向上可分为:金融信贷欺诈、互联网业务欺诈和信用卡欺诈三大类,如果进一步...
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https://camo.githubusercontent.com/87749870bf2928abb9f7a356bba143c1a8de4d4fa7b8bafb1721a33214de61a5/68747470733a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f31313638323237312d633664386436646634393862373236362e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
https://camo.githubusercontent.com/168ca028b2dad41dc4403b387c720514f04bb5734205fd669b53810d86ec7233/68747470733a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f31313638323237312d623030656337656262316131653431372e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
https://camo.githubusercontent.com/7405e13dabf544e2dc855f460920f9f3ca3ee549c45de306224aaf63b9469fd0/68747470733a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f31313638323237312d613761356535303130643962396637332e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
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https://camo.githubusercontent.com/3f050822861c327192f049a7bc6df6b9614c415f766c0103c3512cd25723e55e/68747470733a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f31313638323237312d303439623534393263656530313865332e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
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https://camo.githubusercontent.com/3f1e6a4b983a14f3e0cbbcd5ffa27d4aa16c4bc72c107e921a15654d8fdc1640/68747470733a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f31313638323237312d303736626232306565333932326266342e706e673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
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https://camo.githubusercontent.com/4fb1be11deaa4a3d1a1158d666d84594d9fe7fcd7e3dc37eeecec4b068625a5e/68747470733a2f2f75706c6f61642d696d616765732e6a69616e7368752e696f2f75706c6f61645f696d616765732f31313638323237312d323838383935363532356438323165392e6a70673f696d6167654d6f6772322f6175746f2d6f7269656e742f7374726970253743696d61676556696577322f322f772f31323430
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