I'm not sure about my call here given the sizes of the blinds and my chip position.

Party $10 SNG
Blinds 100/200
Table has been somewhat loose, with the exception of SB (big stack), who has been playing ultra-aggressive for quite some time, raising over half of his hands and winning most pots uncontested.

Approximate stack sizes
UTG (2,500)
Button(2,500)
SB (11,000)
BB (Hero) (4,000)

Hero is dealt

UTG folds
Button folds
SB raises (725)
Hero is all-in (4,000)

Too premature for a push here on the bubble here given the above read? What about in the absence of a solid read? Anyone take a different line here?

last sng I played $55 I went out in 4th with AQ when chipleader called with 56.
Difference there was I was utg and blinds were 300/600 with a 2,3 K stack.

Your read does not help much. the blinds are 100-200 and 4 are left , yes that is somewhat loose.
I think I would have done the same. You are in a bad position for the rest of the tournament and if you fold this one he keeps picking on you. Only if the other 2 players are bad i would consider calling and folding with no hit.

If you wanna make money a fold is best. If you wanna stand a chance winning I think youre play is the way to go.