Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9751de520d7b403…

MALICIOUS

PDF

56.4 KB Created: 2020-09-16 09:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 362b72f2150fe75e74d2149cee7bb0ce SHA-1: 61d95c552887bdd76486987684db9f4911995094 SHA-256: c9751de520d7b403e659a49e6883b79e3e967b307f85c954a226a7a8222725b2
184 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, and another noted a large number of external PDF links, indicating a link farm. The document body contains a URL that appears to be part of the malicious redirection scheme.

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.link/pify?keyword=nc+osfm+transcript In PDF document text
    • http://mixabu.sperrysspot.com/uploads/1/3/1/6/131637014/3198090.pdfIn PDF document text
    • http://pogegun.castlesnshamrocks.com/uploads/1/3/0/7/130776099/kodomulumolulox-fomajuvot-nasezow-mosidax.pdfIn PDF document text
    • http://files.hamiltonhillhounds.com/uploads/1/3/0/7/130740112/zisexipova.pdfIn PDF document text
    • http://files.shenteachers.com/uploads/1/3/1/4/131483685/xixubuli_foradosidi.pdfIn PDF document text
    • http://mewis.t9corp.com/uploads/1/3/0/7/130775565/0c459.pdfIn PDF document text
    • http://kevoji.minstrik.com/uploads/1/3/1/3/131383309/joxewulisobuko_dexewuma_mabomike.pdfIn PDF document text
    • http://files.bentonlegacy.org/uploads/1/3/0/7/130776060/luwez.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/1/0431/5555/4458/files/fubexekezewilebesud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6738/3712/files/60453392055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/zawiporo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/rotugazosizadulovuwujuvef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8441/7691/files/unblocked_games_mayhem_4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D2 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0000a1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CC 5096 bytes
SHA-256: 4a5eb452cadf2082bba7c312ac09523da9b68e5a6780a7fe966a5ddd69272231
font_02_sfnt_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 9692 bytes
SHA-256: db0656bff228411fa76bbd2a44fa17a9c87c6de62357b417dfec88383f65815a

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