walmart.com is legit (walmart is an online/brick-and-mortar retailer based in usofa.  when you buy something from it online, you receive a package tracking link.)  
whether or not walmart.com or any of its sub-domains have been hacked is unclear.  (perhaps you are victim 0 - it works!)   asking if a site is legit after you've visited it is interesting; we should be asking you.