Samsung Galaxy S3 - Play Store opens on its own when unlocking phone?

I have noticed that just a few days ago, I would unlock my phone to the home screen, and as soon as I do, a caption at the bottom of my screen says "TOP FREE GAME", a bit.ly link opens, then some ad tracking website, and finally I end up at the play store to download some game app.

How can I stop this from happening?
Is it possibly a virus? I don't remember downloading any strange apps in the last few days or tapping on any unfamiliar links. I never open ads either.

Any help or anyone with the same problem would be appreciated.

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