Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f3f3545e63bc9a…

MALICIOUS

PDF

45.8 KB Created: 2020-09-12 11:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02cb6f27731447126ea7f9f99728ff6d SHA-1: 45b4708f1c0de2fe7ad5d83891247e0920cf8611 SHA-256: 54f3f3545e63bc9a64e182f546e8ec114f22f8b03f3fbaf2dd29efc6366b0bd3
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the link farm and redirector are strong indicators of malicious intent.

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/wb?keyword=pasatiempos%20y%20juegos%20las%20tablas%20de%20multiplicar%20pdf
    • http://files.elainecairneyhomeopathy.com/uploads/1/3/1/4/131437044/dumutejesok-kumofakex-dukagew-fevumu.pdf
    • http://fonaj.jessicaslaymakerart.com/uploads/1/3/0/8/130874276/poxotojijutadilawim.pdf
    • http://depon.velocitydistribution.co.nz/uploads/1/3/1/8/131860553/9d751cc24a06e.pdf
    • http://guwujog.biofieldtuning-nj.com/uploads/1/3/0/7/130739956/muxugukodeloran.pdf
    • http://files.wallacewoodworkslogfurniture.com/uploads/1/3/2/6/132682899/jonuzumovotaxi.pdf
    • http://zukotemer.toeringexpressions.com/uploads/1/3/2/7/132712615/9b7c8734d882.pdf
    • https://static.usrfiles.com/ugd/bf07b1_505340a7d42b4445bfaffa0ad91a7d82.pdf
    • https://static.usrfiles.com/ugd/ae15ca_cfe4db8974694edb934a219370c5094e.pdf
    • https://static.usrfiles.com/ugd/e4f6f0_b57cd52bb4c5423188e0fd8db522e95a.pdf
    • https://static.usrfiles.com/ugd/8b49c6_9d6377810fba4e5e9970c7702ac9d85e.pdf
    • https://static.usrfiles.com/ugd/b8c837_671c8c852bd8412b8eb3fa29d4ddc315.pdf
    • https://static.usrfiles.com/ugd/595093_9009e0f556bf4f1f839ede7e613b9f3a.pdf
    • https://static.usrfiles.com/ugd/84a5c6_aa372fed424746acb4e1095c111796e2.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_off00006fb9.bin
a153be768dd3fd04118d011f59833bf91becb59bba240c6d5f946fdab36f24ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 5792 bytes
font_01_sfnt_off0000836f.bin
0631e1cf33702da79e81a67f6fbcfe07759bf319caa79085d6d916fae113d5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836F 11792 bytes

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