No reads, poker tracker not working and he is new to the table. Range is like JJ+ with low waiting, maybe AJ, J9, J8s, 99, 88, 55, Q10 or just stupidness? A easy fold on the river? maybe even the turn?

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

CO ($25)
Button ($27.65)
SB ($26.85)
Hero (BB) ($31.80)
UTG ($23.55)
MP ($25)

Preflop: Hero is BB with 6, 7
UTG bets $0.50, 1 fold, CO calls $0.50, Button calls $0.50, 1 fold, Hero calls $0.25

Flop: ($2.10) 5, J, 9 (4 players)
Hero checks, UTG bets $0.25, CO raises to $1, Button calls $1, Hero calls $1, UTG calls $0.75

Turn: ($6.10) 8 (4 players)
Hero checks, UTG bets $0.25, CO raises to $3.25, Button raises to $10, Hero calls $10, 2 folds

River: ($29.60) 5 (2 players)
Hero checks, Button bets $16.15 (All-In), Hero calls $16.15

Total pot: $61.90