Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81f297d90580698…

MALICIOUS

PDF

28.6 KB Created: 2020-10-28 08:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f99c64ebdb91e146679210a37b788cbc SHA-1: ab2a34086f0ec43d05f8c23ccd201328abc1691f SHA-256: e81f297d9058069893449ff196d4165fea0a99c5608fb61d4c6defedf0f263e4
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and URLs, suggesting it is not intended for direct user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=2009+international+prostar+warn+engine+light In PDF document text
    • https://sujibume.weebly.com/uploads/1/3/4/4/134442643/4a1b0881d5b.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/8746776.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/riwokezudenuxi.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/6115494.pdfIn PDF document text
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/c8f1e502.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/b9cdf.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/7052409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5f90fff6625e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f90616f6dee3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0794/0520/files/zodarabemukoduvurex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2012/7903/files/33499491979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/56514741980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122efdc9-f0c9-4de5-a372-c98527678547/caucasia_danzy_senna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e69d206-6c52-4986-a562-3469ad107061/50006256311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a1c17c-ccf0-4df3-a42a-6f842d1fa09c/bavuvakexaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0d15db-31ca-4943-81a7-b9eac36aef4b/1999_porsche_boxster_owners_manual_p.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/rupujorowesivanedofagud.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/naxinuferufoxotedelumekex.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/web_application_development_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/lonezone.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5508 bytes
SHA-256: d21ae81786b94487a7e52e0c337305e4c472ad8a5d2220d4f20cb081ec0de9dd

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