Malicious PDF — malware analysis report

Static analysis result for SHA-256 244f3be37957a236…

MALICIOUS

PDF

45.0 KB Created: 2020-09-30 04:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf938eb9bddd737299c7aa84b2026269 SHA-1: d2d380984eca23b18a7e0445e37b00210e295e14 SHA-256: 244f3be37957a23664d710651efb18c20bc7fe9f6af5fe7a3f266d7b65f60954
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The primary URL, 'https://ggtraff.ru/strik?keyword=a+league+fixtures+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=a+league+fixtures+pdf In PDF document text
    • https://site-1036684.mozfiles.com/files/1036684/55871166594.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/59523404076.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/61325670539.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/53137399520.pdfIn PDF document text
    • http://files.shepherdscott.com/uploads/1/3/2/6/132695325/wegegekukozir.pdfIn PDF document text
    • http://mezugo.emaljesmykker.no/uploads/1/3/2/6/132681426/gurutuxedupivizojizo.pdfIn PDF document text
    • http://dubajusak.joelingram.com/uploads/1/3/2/7/132740890/7426196.pdfIn PDF document text
    • http://fivuz.aeskelly.com/uploads/1/3/2/6/132681352/2450931.pdfIn PDF document text
    • http://punibo.wrhs65.net/uploads/1/3/1/4/131437792/3642710.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/eeadef2e-5ac1-4b0f-bb73-57aec97b96dd/13781811938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03dfd54-fd59-4280-b3e4-c4aa3d87d777/suvepiliwudosizumimubel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9a2823-51aa-41f0-8ef7-0ec8dbf46882/lurixibumisoximexejekig.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C52 5264 bytes
SHA-256: 4a489effa22331766c0e35721eea6a972a73c6395ead528ceecf83f70fd8e445
font_01_sfnt_off00006e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 19368 bytes
SHA-256: 1a1b27703585bc7cf6866a1583fd50cfdde5531ab8cfaff43f2f57ef18b83bca

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