How to Adjust/Re-square 4' x 4' Concrete Slab
It doesn't look square or 4 ft wide. Two or 3 AC guys just moved a 3' X 4' X 3" thick concrete pad 100 ft to set the new compressor on . I didn't watch but the only equipment they could have used was a hand truck. A few years ago I re-leveled  about 25 ft of 30" wide, 4 to 5 " thick sidewalk in 6 ft sections. I used a few car jacks ( scissors type work best) , pry or wrecking bars and numerous brick and cinder blocks; I needed to raise one edge about 6". And shovels. It took several hours over 2 days, but good exercise. Your pad looks like the edges may not be integral with the center and may separate when a side is jacked up. I think the first step is to dig down and find out how thick it is and dig out the soil on the side to which you want to move it.