Can a team that commits an intentional penalty to get the ball back?
 

Consider this hypothetical NFL situation:

Team A has the ball at their own ten yard line with 2:35 left in the game up two points. Team B has no timeouts. The next play the running back is tackled in between the hash mark beyond the line to gain for a first down at their own fifteen yard line. Normally, Team A will let the clock run to the two minute warning and then take three knees to end the game. However knowing this right after the running back is tackled, a member of Team B hits the running back late for a fifteen yard unnecessary roughness penalty. It is fifteen yards, but in the NFL, the clock in that situation will not start until the next snap from scrimmage. Therefore Team A has to run a play before the two minute warning. If they do not get a first down after running two plays post the two minute warning, Team A would have to punt the ball away with 40 seconds left to Team B with a decent chance to get into field goal position to win the game.

Are you sure about that ruling? I could understand if A were trailing in the game.

Since the penalty occurred inside of five minutes of the 2nd half, the clock would start on the snap.

Rule 4, Section 3, Article 2

(f) If the game clock is stopped after a down in which there was a foul by either team, following enforcement or declination of a penalty, the game clock will start as if the foul had not occurred, except that the clock will start on the snap if:

(1) the foul occurs after the two-minute warning of the first half,
(2) the foul occurs inside the last five minutes of the second half, or
(3) a specific rule prescribes otherwise

As for the proposed question, I thought I've read a ruling that says the clock would start on the ready but I can't find it.

NFL has a provision, 4-3-10, to prevent such action by the defense to conserve time, but it applies only in the final minute of a half.

However, in the case referred to above, is that "a down in which there was a foul by either team", or is it a foul between downs?