A very simple solution using PowerPoint:

1. Select the cells in your Excel-Sheet, copy them

2. In PowerPoint: create a new slide, remove everything

3. Paste the cells into the new slide; use option "Keep source formatting"

4. Select the pasted cells in PowerPoint & right-click: select Save as picture

5. In the Save-Panel: choose option 'Save as Type' PDF

6. Select file path and save

Hope this works for you!