Avast security blog reports that malicious apps on Google Play have a huge target audience and are downloaded by millions of users. Some of them even lead you to legitimate companies. According to Avast blog post Durak card game app was the most widespread of the malicious apps with 5 – 10 million installations according to Google Play.
Read more here - https://blog.avast.com/2015/02/03/apps-on-google-play-pose-as-games-and-infect-millions-of-users-with-adware/