I received a tiny BTC deposit in my wallet recently. I don't know where it came from and I hadn't sent or received to or from my wallet in about 2 weeks before the deposit. Could this be something to be concerned about?
Whatever you do, don't open it! It will give the keys to all your wallets and then the sender will get all your coins. Please be careful! It is a scam.
I don't think you understand. OP said he received a small amount of BTC not a file. I have only gotten this a few times but some companies send out very very tiny amounts with an ad attached. So if you look at blockchain it shows companies ad above the actual transation.
No it is nothing to worry about.