Urdu is apparently traditionally written in the Nastaliq style, and not in a Naskh style.
I have found an MIT licensed font that is using this style and that might be good enough:
http://openfontlibrary.org/en/font/hussaini-nastaleeq
A user has given positive feedback on this:
https://en.wikipedia.org/w/index.php?title=MediaWiki_talk:Common.css&oldid=prev&diff=581321602
I'm not sure about the license question, but if it's possible I think it is a good idea to add this font to the urdu language set, so we can do further testing and possibly at some point promote it as the default if the Urdu community would desire so.
Version: master
Severity: enhancement
URL: https://www.mediawiki.org/wiki/Thread:Talk:Universal_Language_Selector/Nastaliq_font_for_Urdu
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=46693