This is the latest phishing scam.
If you get an offer from one of the major supermarket chains on WhatsApp best not to open it. It's not clear if this scam works by you inputting your data or if by clicking the link you download malware. Best not to try.
1. Phishing is normally a bogus / scam email but it appears the criminals have now migrated their criminal ways to apps.
2. I always believed WhatsApp was a closed social media. In other words, you should only get messages from your circle of friends and it is free of annoying ads. Actually, I now believe this particular message is shared by friends which is a neat workaround and makes this scam even harder to spot. Quite sophisticated.
3. Not sure if this will protect you, but no harm in checking you have anti-virus on your phone.
Scammers have used WhatsApp to trick people into handing over personal information by tempting them with bogus supermarket vouchers. The messenger app was used to send fake vouchers to people, purporting to be from trusted chains such as Asda, Tesco and Aldi. The messages claimed to offer hundreds of pounds in savings so long as the user followed a link to an online survey asking for personal details.