Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bda8d34157cb51…

MALICIOUS

PDF

68.2 KB Created: 2020-08-17 06:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf158bd4e4fe9730682c5c11d0f25619 SHA-1: 1b30ae1ddc11f8f955961f4a63bfe2cf4f07f92a SHA-256: b9bda8d34157cb51877d6e7e72b81b5f4f1f18db1c2a0151d84541736d709f70
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'https://ttraff.ru/pify?keyword=gmat+official+guide+quant+review+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of numerous other links, identified as a PDF link farm, further supports the malicious intent of distributing potentially harmful content. 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.ru/pify?keyword=gmat+official+guide+quant+review+pdf
    • http://files.turningheadsdesign.com/uploads/1/3/2/6/132681647/78d817d.pdf
    • http://files.dyncps.org/uploads/1/3/1/4/131406841/f1dfa258c35f545.pdf
    • http://xokijenab.geauxhistory.com/uploads/1/3/1/6/131606727/sadesivazedefa_vupaponivowitom_zipif_gowamoxazuja.pdf
    • http://files.guttenbergcreativitycenter.com/uploads/1/3/0/7/130740022/vetusixux.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/52546027288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/tufilipipikinunagajebuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8383/files/88129646949.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87074842841.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/lafuguparulatavumojog.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/52833967130.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/fawepaxuzuvatufepiweguda.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/sedapomuzidewavibudanara.pdf
    • https://cdn.shopify.com/s/files/1/0432/3658/9730/files/14578096083.pdf
    • https://cdn.shopify.com/s/files/1/0430/4194/7801/files/13507884884.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_off0000c096.bin
f6612299669cebbf480362e2c17d7468c6c8cf155c516e7bd8f1e565fb3b3b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 5608 bytes
font_01_sfnt_off0000d397.bin
3a33fbc2fa7ad645571b0529a6b54d16ce2ae0602ece8997a355f3ade46f482f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 15608 bytes

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