Apps appearing on my iPhone 5?

My iPhone 5 is completely new and is not hacked or anything. Apps have been appearing on my iPhone; apps that I've never downloaded before. For example, a cute game called Mandora was downloaded to my phone just now. It was not there a few mins ago.

It doesn't look like any sort of malware but I just want to know if this is happening to anyone else. Is this some sort of marketing strategy?

If you've signed in to your new phone with your Apple ID it'll download the apps you have already on your account. I doubt if brand new ones appear by themselves, iOS won't let you download anything without entering your Apple ID password.

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