In one scheme for defrauding online ad networks, a fraudster, typically outside the United States, operates large banks of mobile devices and perpetrates click fraud. To maximize payout, the fraudster devices pretend to be in the US or other high-income country, where the payouts are substantially higher. This disclosure describes techniques to detect such ad fraud by showing suspected fraudulent users an ad that involves a series of tasks whose solution requires working knowledge of the language of the locale the device is detected to be in. Languages other than that of the claimed device locale are made available. Selection of another language by the user increases the risk score of the device.

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This work is licensed under a Creative Commons Attribution 4.0 License.