Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aeb7aab966d9dc3…

MALICIOUS

PDF

43.2 KB Created: 2020-10-06 12:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ce9d586bb108327b54771b70c8b4f946 SHA-1: d0ec533cb484d1b06cbc8c76c682f819e03e2950 SHA-256: 6aeb7aab966d9dc3cc23a98100ff17da39a93d285babc3d49fe1da0bbdc8f5d5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting domains and redirector infrastructure. The primary link, 'https://cctraff.ru/strik?keyword=congruent+angles+worksheet+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to these links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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=congruent+angles+worksheet+pdf In PDF document text
    • http://files.pslerevision.com/uploads/1/3/0/8/130874391/119296922.pdfIn PDF document text
    • http://fibevagi.trinityreformedpres.com/uploads/1/3/2/6/132682883/2884478.pdfIn PDF document text
    • http://files.vk3sn.net/uploads/1/3/1/8/131871894/d40f274a4b81b4.pdfIn PDF document text
    • http://xunixivi.ozgurince.co/uploads/1/3/1/8/131856543/tuguzutanoxok-jafis-lutirikatenuvon.pdfIn PDF document text
    • https://site-1039381.mozfiles.com/files/1039381/pugazek.pdfIn PDF document text
    • https://site-1039382.mozfiles.com/files/1039382/90307737342.pdfIn PDF document text
    • https://site-1043607.mozfiles.com/files/1043607/fitiripovolira.pdfIn PDF document text
    • https://site-1037828.mozfiles.com/files/1037828/77571517036.pdfIn PDF document text
    • https://site-1043837.mozfiles.com/files/1043837/jojifixus.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/43c733dc-2108-43af-be5f-1d8af482b72b/60070158130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef351c38-9b0e-4e59-819f-d87f217475e4/rajurofif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14ad421-9f03-4a9b-a3c1-e399d844e23d/gagefulopokug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9211256-0633-473b-be21-42051a339134/22677005471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10aca45-4f3d-4105-b2ec-a90b11091663/kuruboxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9529/3094/files/wopizif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/80662094315.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_off00006a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9F 5364 bytes
SHA-256: 28ce409f2678c510eb5556b425cd05b033e6341d2ff4fc8b5186aeb3cd8197c0
font_01_sfnt_off00007cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEC 10252 bytes
SHA-256: 15a0f05a00781463683c85ae6f1ee603a4db5de312f62adcda143dc4cd65d950

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