Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ce70dad5e41501…

MALICIOUS

PDF

45.3 KB Created: 2020-09-07 14:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00386db2b1d44c74cbed7fa1489a337a SHA-1: f2bb1c77be19c7c80887ea528ec57b7525cdadd6 SHA-256: c7ce70dad5e415017a90f5697007ed94ba211d86e338734febfcde78e9c7436b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=hangout+app+free++for+windows'. This URL is presented within the document body, disguised as a download for a popular application, aiming to trick users into clicking it. The PDF also contains a link farm, with many links pointing to static.usrfiles.com, though these appear benign. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=hangout+app+free++for+windows
    • https://static.usrfiles.com/ugd/7baf93_4ef414635b8149c988af5c1b4a800f7f.pdf
    • https://static.usrfiles.com/ugd/429b25_1f62e84f379941069fe4d83609805d15.pdf
    • https://static.usrfiles.com/ugd/717a42_3bdf0d5fbdd1491eb799d35429eb4218.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74098669839.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/jafukukodeliviv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6440/1818/files/amma_nanna_tamil_ammayi_audio_songs.pdf
    • https://static.usrfiles.com/ugd/19103d_120285b91e38460ea59422784a3d7cc6.pdf
    • https://static.usrfiles.com/ugd/69b86f_2a83646e28d74c5ba020cb06a93b47be.pdf
    • https://static.usrfiles.com/ugd/f59309_f96b96f3faa04133b96f79818cb314e3.pdf
    • https://static.usrfiles.com/ugd/aec2ea_013b69d52a284b26bc793aa2f50b6adb.pdf
    • https://static.usrfiles.com/ugd/314c35_01b135720e604c52899827467a075ff6.pdf
    • https://static.usrfiles.com/ugd/67e251_6684f50d51884c1cad04c21188081ea4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c308b80a8334f6cbbac0840859dd934.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065d2.bin
2529dbf951df1b2e264a8e0751b592500db5554731d40f98fe888098ced88c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 5112 bytes
font_01_sfnt_off00007752.bin
e05c5728c7abcde71a0677f11959b0101d626022f872ad7a2f19b41f82003471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 10144 bytes
font_02_sfnt_off00009a11.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A11 4324 bytes

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