According to Naked Security, victims see their accounts used to spread the fake promotions, and after installing the apps that promise them gift cards, they are prompted to participate in more offers and online surveys, some of which require sharing of personal information including name, information, and contact details.
Some users are prompted to download questionable tool bars, games, or other software. And others are asked for their mobile phone numbers in order to obtain the nonexistent gift cards, only to find themselves subscribed to expensive text-messaging services.
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Screen grab courtesy of Naked Security.