Unknown App Shows Up in Purchase History
So, I was just doing a routine check for updates to my apps on my iPhone, when I noticed an unfamilar new app on my already purchased app list in the App Store app. Checking out my app store purchase history, it appeared that I downloaded this app on the 6th of November, but I didn't remember downloading this app at all. The only purchases I have made recently were a few in-app purchases (for Hipstamatic and Highborn), as well as the apps System Activity Monitor and Battery Doctor Pro (to monitor my iPhone 4S battery life and system activity - that's another well-known story), as well as a few other free downloads. This unknown app I downloaded carried a Chinese title (快手看片WiFi版), which made me extra suspicious as I have never downloaded any Chinese apps (as a matter of fact, I don't trust made-in-China apps and I won't download any such apps if that fact is quite apparent, and I delete any from my iPhone if I find out said app is a China product).
I have tried using the Report Problem button in the App Store's Purchase History, but it doesn't seem to have any effect. I asked my mum, the only other person to have access to my app store account, and she said she hasn't been downloading any apps either (she only uses my account to update apps I purchased that I downloaded onto her iPhone). As a precaution I have changed my password just to be on the safe side.
Can someone please investigate this issue for me? I really suspect something fishy is going on here.