How can we get content/file of a signed copy from document url

Hi,

Is there any possibility to get the signed pdf from agreement Data using apex code? I have seen we have file document link in one of the field on agreement.

The link is :- 
https://baseurl.my.salesforce.com/apex/echosign_dev1__SignedAgreementDocLink?agreementId=aLPDE0000XXXXXXXX