Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f81e8de88f5a784…

MALICIOUS

PDF

35.8 KB Created: 2020-10-01 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8eb761d196913f3ad371745b4d05cd8a SHA-1: e04b3ac0e926f72411484147ebbc90425c1f705e SHA-256: 2f81e8de88f5a7841f5f453649215a6cebad3982b21cbac263435454fd5c106f
184 Risk Score

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=b-+262+bobrick+pdf In PDF document text
    • http://fibux.figman.com/uploads/1/3/1/4/131437987/6413855.pdfIn PDF document text
    • http://bukivis.griefyork.com/uploads/1/3/0/9/130969448/5a2c699ee54.pdfIn PDF document text
    • http://files.thelittletheatreindia.com/uploads/1/3/1/4/131408224/86a04ae4b2e.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/wutafaxeje.pdfIn PDF document text
    • https://site-1038547.mozfiles.com/files/1038547/89572708013.pdfIn PDF document text
    • https://site-1039307.mozfiles.com/files/1039307/49101249358.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/25385373841.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/41e56a7d-ae44-44be-8115-07f0c064d2e0/jozusugidor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b417cb64-4c47-45ca-bf50-4d27b05006d6/tatilenewumar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d572834-7c98-4cc9-b67e-00cf83b27b13/jirupudimozuwanijekuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db1d3b8-308a-4ef7-8afa-7789126b3c43/vitonij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9f9362-7928-4260-994a-e86c24f1de4c/xarivivudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4901cc70-2501-4259-a963-b572f989a9b5/zuriroguzat.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_off00004ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDD 5300 bytes
SHA-256: 6c0f223d72c359f025fe4949612717276af9a97a87f24d6ce3e322f7b6d178c9
font_01_sfnt_off00006007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6007 10232 bytes
SHA-256: 7651e8f9a897ad7c50a5e812dbf2a57e02b3b11414d3c98ea99e3bbb9cee12e5

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