Malicious PDF — malware analysis report

Static analysis result for SHA-256 66312ad434d35f05…

MALICIOUS

PDF

44.4 KB Created: 2020-10-02 08:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 84db3ce9355e3f1f32a8465bf05ca0fb SHA-1: d88d57f20aab0bdaacd5befe9982c8ac99c33821 SHA-256: 66312ad434d35f05b0662052d71144c50a6dc38ce4e5fffd128dd8f68082e24b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and critical heuristic firings strongly suggest malicious intent. The document body, though heavily obfuscated, contains URLs that are part of a link farm designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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://ggtraff.ru/strik?keyword=mathematical+methods+for+physics+and+engineering In PDF document text
    • http://wobod.mrsjonescoldbrew.com/uploads/1/3/1/4/131438500/jukoba_xelodorotabim_zegoxeg.pdfIn PDF document text
    • http://dolet.rebeccathein.com/uploads/1/3/1/6/131636648/fazawiligebusidebob.pdfIn PDF document text
    • http://files.ieleaders.net/uploads/1/3/0/7/130776718/45c35ab516bd.pdfIn PDF document text
    • http://gojaj.repa-program.org/uploads/1/3/1/8/131856819/1182291.pdfIn PDF document text
    • http://files.catholiccharitiesvc.org/uploads/1/3/0/7/130776518/9722124.pdfIn PDF document text
    • http://zakabox.extratimeconcierge.com/uploads/1/3/0/7/130775565/fc095a32a7.pdfIn PDF document text
    • http://files.gradcincinnati.org/uploads/1/3/1/1/131164063/dugakiwizon.pdfIn PDF document text
    • http://kosogase.briannaholt.com/uploads/1/3/2/6/132681976/4573931.pdfIn PDF document text
    • http://mabakek.runningoutdemons.com/uploads/1/3/0/8/130813612/e2460aaaf9363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7e2a67-b157-4c96-9fea-56a62c157688/memojibajoworiwifibevezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800a03fc-a337-4c33-8edf-5d96cccee566/92334529895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3263d9a-663e-4c71-839a-e012bbbf9f97/37469944813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb81b54f-cb5a-41cd-ae4e-ca4f7f74a9c0/13006144584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd121d0f-10d6-4350-8820-249e134dc8a0/71614189644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0375d9cd-0b5e-497d-b2dd-24d4732d1219/69121532327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42981ffb-a0e0-475a-8d78-ddb5ad9d618f/kuzirumalaloke.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_off00006cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC1 5676 bytes
SHA-256: b903c86e3c17bad49cec74c79bbb206f2877fa7faa05b1a1e258b969d02d7e63
font_01_sfnt_off00008001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 10776 bytes
SHA-256: ce020b331a492fbd6c1bd7196fcf4f6f29ed20332d01c511638a53d7c1989445

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