1) I recently came to know that there are not many authentic narrations/hadith which state the arrival of dajjal or who he is, there are only few hadith which state dajjal so my question is whether dajjal is a legit person who’ll arrive or it’s just a hoax.Any refrences?

2) So he’s not real if we don’t assume and go by the narrations.
There’s no mention of dajjal anywhere?

1) As you said, there are no authentic narrations from our side about dajjal. However, if he is not a hoax, the definition could applied to any one who has the same characteristics.

2) No. Nothing mentioned in Quran.