Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4ab4d66d778069…

MALICIOUS

PDF

40.1 KB Created: 2020-09-18 03:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c6b981caba877a353de1a4ca5f1ff479 SHA-1: aa81a880ade10ddafaa1a1356026ccf299d5d2b6 SHA-256: ea4ab4d66d778069a8e208f36df21193b6af3e775840ae23019287c31acd56cd
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO poisoning or redirection to malicious content through a link farm. No scripts were extracted, limiting the analysis of direct payload delivery or execution.

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=ions+formation+worksheet In PDF document text
    • http://files.priorityoneinc.com/uploads/1/3/0/8/130813526/dikoxupumiji.pdfIn PDF document text
    • http://files.taiwanbeaches.com/uploads/1/3/1/0/131071114/rotupa.pdfIn PDF document text
    • http://towaxidem.oipelmiracorning.com/uploads/1/3/2/6/132683071/466988.pdfIn PDF document text
    • http://files.melbatheater.org/uploads/1/3/0/8/130813841/takigubi.pdfIn PDF document text
    • http://files.caymanpensionwatch.com/uploads/1/3/0/8/130814226/resiwetumomob_ferijafesafep.pdfIn PDF document text
    • http://files.restellsaroaming.com/uploads/1/3/1/3/131383825/vifakokunasita.pdfIn PDF document text
    • http://files.airprogerogia.com/uploads/1/3/0/9/130969475/zebusidejov-fawugaziwuna-fegop-juzok.pdfIn PDF document text
    • http://xibek.bonafidemealprep.com/uploads/1/3/1/1/131163507/kufiv.pdfIn PDF document text
    • http://temivokum.ycinvited.com/uploads/1/3/1/0/131070420/1372828.pdfIn PDF document text
    • http://fokuron.samsarahathayoga.com/uploads/1/3/0/7/130739069/wodatomaroware-nupulede.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/1/0433/0687/7080/files/wakorijupomimenupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0732/7899/files/guitar_caged_system_print.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_off00005f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 5068 bytes
SHA-256: a523344ce2fa78eae5047d988c984b067aa57ee40a0e49c46f40e2b66bda6e41
font_01_sfnt_off00007045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7045 10444 bytes
SHA-256: b110228cc382bb50df84e4a231126781758b40977f0a96df9376b896f6b199e3

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