Weird, that address does not look like it's been mining at nicehash according to their dashboard lookup and looking at an explorer, the last time it received funds was January of last year.
Ignore nicehash dashboard it's useless, also this BTC addy belongs to nicehash, it's really more or less used as a username, and then you withdraw your BTC to your own wallet, so the process isn't traceable on the public ledger, of course, only nicehash know which mining address sent bitcoin to which address.
Not that it matters since the miner *is* infected, but where do you see that this is a NH owned address?
I googled it and checked a few other places and did not see it linking back to NH at all.
As far as I know you can mine to nicehash 2 ways either with an external address or with an internal one, but even with an internal address it's still a different address for everyone who has one.
-Dave