Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff6fb35d001a387…

MALICIOUS

PDF

40.2 KB Created: 2020-10-09 18:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb2cabf63b0bc63c03264df297939f79 SHA-1: d45026c34a38b0c4f8be68a672c39e94fe4494b3 SHA-256: 0ff6fb35d001a38796d4a135ee68eebcfb46839c46ef689d603bbde8cc2e877f
164 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, likely to facilitate further malicious activity. The presence of numerous links and the redirector suggest an attempt to lead the user to a malicious site for payload delivery or credential harvesting.

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.
  • 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=kanso+sound+processor In PDF document text
    • http://files.hackettville.com/uploads/1/3/1/4/131407823/misotevuvewa_sawoju_mikigakix.pdfIn PDF document text
    • http://rivik.infusionbaroque.com/uploads/1/3/2/7/132712593/zoneluweguvid.pdfIn PDF document text
    • http://files.galleherlumber.com/uploads/1/3/1/1/131163718/3750238.pdfIn PDF document text
    • http://files.stuffweallwant.com/uploads/1/3/0/7/130740624/kajewaf.pdfIn PDF document text
    • http://rukojefoz.ausdiagnostics.com/uploads/1/3/1/0/131070420/5a2685b5ce3b9.pdfIn PDF document text
    • http://files.bankerchiropractic.com/uploads/1/3/0/7/130738531/e5742233d.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/ebca399f-a3a0-4440-9070-5b578b2a41b7/fowud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924ee87b-7e23-4095-b7af-3bc738b82c56/5480646536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b133407a-10f4-4031-9336-8251626e7ded/90056652782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f8e8f5-0f00-4362-a861-e7b7e8d4a0eb/43010096166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6543/3000/files/microsoft_business_intelligence_development_studio_2008_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/81040115798.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_off00005ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 5004 bytes
SHA-256: 20e45f12fed18aff5463006073d889540f5f296963ee5eee3acb80f6278a1389
font_01_sfnt_off00006fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 10836 bytes
SHA-256: 06be743e28d1d89964735e39b30469c13281add3cbf8aed6c319f24da05845aa

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