Apex domains cannot have CNAME records.
Question and response
Question
dig static.pfnllc.net. NS
Answer
static.pfnllc.net. 4 NS ns2.pfnllc.net.
static.pfnllc.net. 4 NS ns1.pfnllc.net.
Authority
The response has no authority records.
Additional
ns1.pfnllc.net. 4 A 74.221.48.10
ns2.pfnllc.net. 4 A 206.51.127.201
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0