Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ec84be6a35dfff…

MALICIOUS

PDF

134.8 KB Created: 2020-08-29 23:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf74a9b4304380cb76905b33fbcb32e0 SHA-1: 1dd20e5c08c216a906140d55989a639db5d37448 SHA-256: 84ec84be6a35dfff264ef9e6a382f37b83fe09fb86c2e4622586b3e6ca0d3684
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, pointing to 'https://ttraff.ru/wix?keyword=how+to+play+garry%2527s+mod+with+friends'. This URL is presented within the document body, suggesting a social engineering lure related to the game 'garry's mod'. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.ru/wix?keyword=how+to+play+garry%2527s+mod+with+friends
    • https://static.usrfiles.com/ugd/b8c837_0e7da20e86824647ba13f40551d8f149.pdf
    • https://static.usrfiles.com/ugd/7ff653_c2a1987286584fac802d525aafae5047.pdf
    • https://static.usrfiles.com/ugd/e745be_a8818e9b97d843399ef0b5e9a9d1e1f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4985129fd57a4576b36b95f300dba106.pdf
    • https://static.usrfiles.com/ugd/b8c837_325fe64390ef4c86b4fdbe8b07b6f517.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/mowuxivovobazafabuwofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/57781179313.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcd8e38937a246e79aa2b37feac3b5cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b75bd4ce4f7415a8768c37507cc0938.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d45e.bin
91a1683671c2d36e4671ac8637a0d308227fc43629598a230daa79cd38805851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D45E 5644 bytes
font_01_sfnt_off0001e783.bin
a29e0317aaaed869d844aa2f96964cd3fb604eef9e47e9c09dfcee6b34905107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E783 11264 bytes

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