Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc9d82909a35928…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 07:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b99b47eb822c799dd74c6a289fc83ff SHA-1: 75b212c86d2ebbb4e52df0b8caa09b8aad507e2c SHA-256: 3cc9d82909a359287af67827e96b6ed212fba1c987789ff18b4e845ed7d69664
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for educational material. The presence of numerous links to Shopify-hosted PDFs suggests an attempt to manipulate search engine results for malicious redirection.

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=big+ideas+math+algebra+2+teacher+edition+pdf
    • http://files.prssasdsu.com/uploads/1/3/1/4/131407918/bugosokonarobebudes.pdf
    • http://files.2447w.com/uploads/1/3/2/3/132302892/zimifobik.pdf
    • http://files.catherine-mcavoy.com/uploads/1/3/2/7/132740181/e9bbb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/16656054815.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/rugemewubukojepozado.pdf
    • https://cdn.shopify.com/s/files/1/0437/3472/8853/files/wow_classic_melee_hunter.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/63512947451.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/call_center_agent_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0440/5706/7685/files/63424249553.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/random_g_eazy_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0435/9864/3363/files/workspace_login_godaddy.pdf
    • https://cdn.shopify.com/s/files/1/0448/0362/1025/files/mivedirowujebomitapul.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/problem_solving_cognitive_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/accounting_cheat_sheets.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_off00006777.bin
dc16eddd98b263f98c0f896d0c70462a1a74b7a29b428aed40702c4a7838d596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6777 5888 bytes
font_01_sfnt_off00007b5b.bin
138d3e14201bf4a11d5a8715ecfdfcea36c0155ce46fa315f5c95e899f30c9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5B 9532 bytes

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