HELP PLEASE: Pettocus.info on android phone

[newtusmaximus]

Apologies for posting this here.  Not sure where else to post
  A popup of pettocus.info has started doing the rounds on android phones.It appears to be a redirecting malware.  It gave a false virus infection warning requiring immediate updating of android.  If this link was clicked presume some code was downloaded to the phones phishing etc.
In a family members case, it is unlikely that the phone has been previously backed up  so all  stored data address books photos etc are only on the phone and would be st if doing a factory had reset so.

QUESTION.  If the phone date is now backed up to an externally plugged in hard drive or usb of sufficient space. and then the backed up data were to be scanned on my LL laptop, what could/should I use to vigorously scan it to ensure it is clean and will not recontaminate a freshly reset phone?
Thanks