Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ff001afc84ba3c…

MALICIOUS

PDF

43.4 KB Created: 2020-10-09 03:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2dde14d158b8c440cdc4343fc5abfc70 SHA-1: a604de117ea5be80f0f9497fa7b26516c3e2ee06 SHA-256: 09ff001afc84ba3c9ac42b8963a9fb947e9ff6c297e26d96a231d75665cfa4f4
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document employs a social engineering tactic, presenting itself as a style guide to trick users into clicking links. These links redirect to malicious infrastructure, including a known redirector, and a large number of other PDFs hosted on disposable domains, indicating a link farm for SEO manipulation or traffic redirection. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's designed to lure users into installing browser-related software, which is a common method for malware delivery or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cctraff.ru/strik?keyword=bsbadm506+style+guide In PDF document text
    • https://site-1037079.mozfiles.com/files/1037079/5828281832.pdfIn PDF document text
    • https://site-1038363.mozfiles.com/files/1038363/dudos.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/gedamowikusoduxupo.pdfIn PDF document text
    • https://site-1041949.mozfiles.com/files/1041949/61313445856.pdfIn PDF document text
    • https://site-1038525.mozfiles.com/files/1038525/42615696281.pdfIn PDF document text
    • http://files.vegantshirts.ca/uploads/1/3/0/8/130814133/xineb-bajojul-kuniloburarine-fadimipu.pdfIn PDF document text
    • http://kemevopog.flickofthewriststudio.com/uploads/1/3/1/6/131606620/genovelamo_xinilajudigax.pdfIn PDF document text
    • http://rewefawe.wes-pto.com/uploads/1/3/2/7/132710575/soluguxogorur.pdfIn PDF document text
    • http://files.evoequine.co.uk/uploads/1/3/1/3/131398559/texat_ruxawidimok_newuzawoxuv_nalov.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/3a1e7358-e2a6-4423-8446-4044bb6637c2/57787567381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbbdae1-7f7d-4e02-9449-f558081f626e/9242157330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819b2588-1800-408b-96a8-6057c08d0a54/16703641179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36255651-049f-4d16-8c4f-e55730918765/81572391937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1b8cac-ae24-4ac5-a5b3-f9b600736ef4/bafipagobepamadimumonu.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_off00006b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B02 5760 bytes
SHA-256: 0741996f2953ac8946aeb55b88a774880727cb3b92713b4ae16cab97c4a886b0
font_01_sfnt_off00007e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E95 10068 bytes
SHA-256: 9b86a345752bc8e164a991f193dd7207782cad54603254bd5837ceb172c8dd26

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