Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25a7d600cf8fca6…

MALICIOUS

PDF

39.5 KB Created: 2020-09-07 15:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad842e1f1caf50363bafe1c5bf937898 SHA-1: 53b93cf525cd52db19f413d3a776c762a73fa596 SHA-256: a25a7d600cf8fca6a99e0074b175f33ece5b2ff47b7422c765541dc6b0eeb840
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/pify?keyword=hhs+program+specific+audit+guide', is designed to redirect users to malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO poisoning or to obscure the malicious redirector.

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/pify?keyword=hhs+program+specific+audit+guide
    • https://static.usrfiles.com/ugd/289c5e_365bae4dde6240dea4d0ac8762957f2f.pdf
    • https://static.usrfiles.com/ugd/48bf55_b7620e971112456e9517c41450a57f1a.pdf
    • https://static.usrfiles.com/ugd/6c032c_989d6ca113cf4815addc151c44660d95.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/96729531494.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/folenebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9112/3614/files/citadel_forged_with_fire_spell_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.pdf
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/jokolu.pdf
    • https://static.usrfiles.com/ugd/b8c837_28410656406e4946852adc44fe522506.pdf
    • https://static.usrfiles.com/ugd/d3758e_8648f33023774872a23795f25fae6d7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef2bd8778cf849fd9c7f220d72f0503f.pdf
    • https://static.usrfiles.com/ugd/aaaf79_4bd4dd0d0f954337b8543aeae4085307.pdf
    • https://static.usrfiles.com/ugd/1e557c_5c6df169e3ce45d5ae023f0c09b55b50.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_off00005d71.bin
dc0e1d0682043e2a5fa3b473558cd72b52849091479452f31508f74b014f83c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D71 5500 bytes
font_01_sfnt_off00006ff9.bin
d0c2bfae0f8053d00805772781b7583f0aafa006bb177824c6821cac3a59ac11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 9864 bytes

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