Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f66bc81c546891…

MALICIOUS

PDF

33.8 KB Created: 2020-09-17 21:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: afdf292c1782a5a4aa1fae3c766e8cdd SHA-1: 2f6c745ec2b1f2fac01bae0462118dd96bec627c SHA-256: b8f66bc81c5468910d0c30de832b7dbe154892260fb82aa783833b9dd4f8d340
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create SEO link farms or to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics point to a link-based redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/wix?keyword=cheap+tiny+bikinis In PDF document text
    • http://files.oceanpinesplayers.com/uploads/1/3/1/4/131406827/kopixukiledijuruda.pdfIn PDF document text
    • http://sofirimok.homeacademy.sanctafamilia.org/uploads/1/3/0/8/130814526/wijumegonuleb_vejalewe.pdfIn PDF document text
    • http://mupiwami.thymomahope.com/uploads/1/3/1/0/131069839/8793855.pdfIn PDF document text
    • http://files.hennessyspeechanddrama.com/uploads/1/3/0/7/130776208/9565686.pdfIn PDF document text
    • http://files.tutor.ifljumpstart.com/uploads/1/3/0/7/130775102/d29d501d.pdfIn PDF document text
    • http://vufud.kmid.com.au/uploads/1/3/1/6/131606156/2150784.pdfIn PDF document text
    • http://pepid.eastbournetherapy.co.uk/uploads/1/3/2/6/132681488/luvegezowibuz.pdfIn PDF document text
    • http://files.fumcplattsmouth.com/uploads/1/3/1/6/131637881/dofegotiga_roxineme_tedosifuduwuv_nonil.pdfIn PDF document text
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99466eaa-36d2-417f-9e89-28aa99776897.filesusr.com/ugd/cf5aa9_b354ad03abe04581b150d494dfe2c681.pdf?index=trueIn PDF document text
    • https://a1bdb802-4666-4a4f-84dc-6ba72b83ddd2.filesusr.com/ugd/db1da1_c4b6131154124d188501dd01893610ac.pdf?index=trueIn PDF document text
    • https://af5e5276-cea1-41ba-9718-d9181add2bbb.filesusr.com/ugd/285be4_ffbf16d207a241eabe70871016b628f2.pdf?index=trueIn PDF document text
    • https://36eb9d94-29f3-4ef0-b98f-d4a1547795d7.filesusr.com/ugd/9ea91e_5d166a4dd455490cb259f04595814a1c.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/grateful_dead_100_songs_poster_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/15603743894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1494/5959/files/rajedifatixeziga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4539/5368/files/be_not_afraid_bob_dufford.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B2F 4992 bytes
SHA-256: a1707ded412d84448e2825db7b8231797711050796356835e97be19ac9b19226
font_01_sfnt_off00005c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C22 8880 bytes
SHA-256: e427dc91faab301b4d5748b7c4421e6d6b1f71e79897a2572bcaf1bc5a9ea8fd

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