Do not wait for his next response, If you recieve another message just go ahead and delete it. Do not try to access those wallet as their might be a hidden malware. If you already have then run a virus scan and be safe.
Nothing is free in this world, there is always a hidden agenda behind everything.
I agree that it sounds like a scam. But is it even possible to implant a malware inside a Bitcoin core wallet? I don't think that the owner of the wallet can do that. As far as I know, the owner can only store coins and transact them. Anything other than coins can't be stored inside a core wallet. In case he is sending the wallet software, then I would have been more suspicious. But as of now, that doesn't seems to be the case. It is just a bunch of wallet addresses.