Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2955fe2abd53c16…

MALICIOUS

PDF

52.1 KB Created: 2020-10-05 23:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 547400fb54fecdbcf231cf168bf33cd0 SHA-1: 79cbc4d9ab77d7448d04d38a6f1fff011a19b4a8 SHA-256: a2955fe2abd53c1666144ceac54cd418469f399244420c7fe01199e617959f19
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm or SEO manipulation scheme. One of the URLs, https://cctraff.ru/strik?keyword=prose+edda+vs+poetic+edda, is identified as a malicious redirector, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure.

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://cctraff.ru/strik?keyword=prose+edda+vs+poetic+edda In PDF document text
    • http://files.westchestercounties.com/uploads/1/3/0/8/130874480/6325448.pdfIn PDF document text
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdfIn PDF document text
    • http://files.peaceforokinawa.org/uploads/1/3/0/9/130969656/sazin_nagobaguxasige_nenupimevu_nevotuseman.pdfIn PDF document text
    • http://wudoleviw.rcctc.net/uploads/1/3/0/8/130874304/c9e5ff3d5e0.pdfIn PDF document text
    • http://zufozemun.alieninvasionmusic.club/uploads/1/3/1/4/131453723/1769887.pdfIn PDF document text
    • http://files.mrmichaelmccloskey.com/uploads/1/3/1/4/131453871/2858698.pdfIn PDF document text
    • http://files.ectocrank.com/uploads/1/3/2/7/132712080/4209816.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/1/0462/2401/5514/files/90453869353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfac1a1-dd4e-4b68-b3a2-ceab4ffd564f/31071351225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606bca6e-a9cb-4bea-96b9-be7dd4b8782f/13112952388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b858aab8-b39f-4a5a-ac1e-e250630c7d7b/29985878201.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_off00008d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3A 5096 bytes
SHA-256: c21fd6370a3668f1645b19f94563fa8648c2e078ad61498769ee7bd7fb5229a5
font_01_sfnt_off00009ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA5 10968 bytes
SHA-256: b4add43c24291f9f1c259c1ee5d8a224eb7792b48e3ee3858cca12af7d1e0575

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