Random smart chain bnb

I was sent $5 worth of bnb from a random address. Looking at the bsc scan it was sent from account that had 250k in bnb that sent all of it within the last day to random addresses. It was sent the 250k bnb from an address that did the same thing and the address before that seemed to have only traded a few random coins. Normally a scam would send tokens in their own coin but this was smart chain bnb. I haven’t bought anything yet or used my bnb on my trust wallet because it just seems fishy someone would do that. Any advice?