Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a58add6cac6d9c7…

MALICIOUS

PDF

41.1 KB Created: 2020-09-05 14:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d4ec411e6abea84480278af48e0828 SHA-1: 0af5a44de47996c156e0c3c0084b8753d0bfe246 SHA-256: 8a58add6cac6d9c7b30386b99e4b7e81d8934ff26e5865be3e2a01c0d258fc16
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.link/wix?keyword=american+chest+guidelines+anticoagulation'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to medical guidelines. The presence of a large number of embedded links, many pointing to Shopify domains, suggests a link farm designed to obscure the ultimate destination. The ML classifier also 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.link/wix?keyword=american+chest+guidelines+anticoagulation
    • https://static.usrfiles.com/ugd/221f3a_cb0bff1fe9924afeafe25278e64150e0.pdf
    • https://static.usrfiles.com/ugd/0adedf_1540a09e01ee405585ebe8aebb947622.pdf
    • https://static.usrfiles.com/ugd/45fd81_c57ffa1129894af19d3468927aa90148.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8989/files/sw_lbsg_net.pdf
    • https://cdn.shopify.com/s/files/1/0435/9693/9427/files/zaregamuba.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/megijerafomopiguwimiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/wovufurivemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3030/6203/files/fifakopiwajurav.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/dagikodibadavatosoz.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_off00005cdf.bin
fa798c5e019e66e8348fec9700e8a99da7d1b1926fa6737f50df7863a1346782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDF 5340 bytes
font_01_sfnt_off00006edb.bin
2dd0cd8a1fdb7ecec34cb611944da4994687fde47a669be7a21d45da2731fba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 13004 bytes

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