Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6b6d0564ec0832…

MALICIOUS

PDF

37.2 KB Created: 2020-09-16 23:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dc4d85d53723cc3e9ac667d80d8ab290 SHA-1: 23404d9dffb2db7894f13c792cc90e481e61cfc0 SHA-256: 3b6b6d0564ec0832741fc1f2120ea6bc1390bd9436711371202e7376f8b3f976
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a PDF link to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The presence of numerous SEO-like PDF links suggests a link farm or a method to distribute malicious content through seemingly innocuous documents.

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/wix?keyword=brinkmann+q+beam+max+million+iii+parts In PDF document text
    • http://fisilu.beautyatthecroft.com/uploads/1/3/1/3/131379874/gijorututerurukos.pdfIn PDF document text
    • http://susajo.mintkidsdentistry.com/uploads/1/3/1/4/131452913/lomekozi.pdfIn PDF document text
    • http://files.kristensmeow.com/uploads/1/3/1/6/131637316/juvulalunole.pdfIn PDF document text
    • http://files.jiucle.org/uploads/1/3/0/8/130814232/nanomugirup.pdfIn PDF document text
    • http://files.watanaberesearchlab.com/uploads/1/3/1/3/131397927/962672.pdfIn PDF document text
    • http://files.rogerscitymarina.com/uploads/1/3/1/4/131406274/xupunenezilum_kinifuwepitopi_mofemaruk.pdfIn PDF document text
    • http://pomid.swtradingcompany.com/uploads/1/3/1/4/131453247/1208481.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/1/0440/3711/1973/files/aviso_de_privacidad_formato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6552/1814/files/12829745174.pdfIn PDF document text
    • https://bc8859bd-704a-4cdb-a02b-dedb8aede744.filesusr.com/ugd/cdfdba_d9cdf0b0b4d047a6a5a790c3c0962d8f.pdf?index=trueIn PDF document text
    • https://4ab5c431-c835-4b68-b0bb-d0ac3a6c89b2.filesusr.com/ugd/80685d_4d469d1913704360b70d15637ba40c6f.pdf?index=trueIn 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_off00005148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5148 5412 bytes
SHA-256: bc1d850084248be077d7513f83ce3e58f5192fd4a46e2e6a6ef1e7f097ace1bc
font_01_sfnt_off00006397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6397 10748 bytes
SHA-256: 864592f361c001f6376c90a9707d85c9332fb4dc775d949f55b369dbad780c28

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