Malicious PDF — malware analysis report

Static analysis result for SHA-256 37368dd14b1a2c46…

MALICIOUS

PDF

47.4 KB Created: 2020-08-19 04:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92f5a46027cf5f8bf3772c551e0637ed SHA-1: 15a2af8756bb321f6b87ef901b94200518093455 SHA-256: 37368dd14b1a2c4640ffb950201531ccc622347118afac26bbc3c622d91c0043
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=bisection+method+step+by+step+pdf', is designed to lure users into clicking what appears to be a legitimate document link. The document body itself is heavily obfuscated but contains references to the same URL and other benign-looking Shopify links, likely to improve search engine ranking and disguise the malicious intent. The presence of numerous links suggests a link farm or SEO poisoning tactic to distribute the malicious URL.

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=bisection+method+step+by+step+pdf
    • http://fuxoten.carriesrealworld.com/uploads/1/3/1/4/131407406/vagegofa_notex_sovinew.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/pibak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/12720689623.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1080/files/ansi_b16_34.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/xafavetikuputitokebe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/uncw_channel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/99645137264.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7430/files/antibiotic_resistance_journal.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/karifesiworesabasam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4623/1449/files/1993_aashto_flexible_pavement_structural_design.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_off00005c46.bin
42f6275208ea2a6dd90370dd5a032d7233d3108acae198f2e2d607e08b857cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C46 5348 bytes
font_01_sfnt_off00006e4f.bin
c214b0861ecda1231d49b22fa8b42bc5c7317663f7238488f1c49974b4743cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4F 14152 bytes
font_02_sfnt_off00009bff.bin
a0532d1212509dae036733b1fb6f303b0d7fd7a209d3928fdad713008da19d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFF 16144 bytes

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