Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9851e74bf8b1a3…

MALICIOUS

PDF

36.0 KB Created: 2020-09-29 19:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 31aff463fdd00f8adc7d10b54eecfdd1 SHA-1: dffb67fd984f5622258ec3793dda032aa6e45a28 SHA-256: ef9851e74bf8b1a39e8cb8d9707702e208fa0868000d8a190926cb59648bd59b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous embedded URLs that point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The document's structure and the presence of many links on disposable hosting indicate a tactic to distribute malicious links or potentially exploit SEO techniques for traffic generation.

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://gettraff.ru/strik?keyword=castrol+atf+dex+ii+pdf In PDF document text
    • http://lipar.simply-sound.com/uploads/1/3/0/9/130969489/d89de2f8.pdfIn PDF document text
    • http://dupikezew.joannasbestdressedbrides.com/uploads/1/3/0/7/130775722/3309727.pdfIn PDF document text
    • http://weluji.michaljphotography.com/uploads/1/3/0/7/130775173/4070900.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/18948818711.pdfIn PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/tinifekuwiva.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/33396928368.pdfIn PDF document text
    • https://site-1037227.mozfiles.com/files/1037227/18970574358.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/dezeferogesesunavaweve.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/89024001244.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/32343059315.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/28577100675.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/ac9b49fe-ba17-4db7-92ec-81967c41a86e/63193754480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94290f8-619c-48ff-88bb-42ccd310d4b4/19457433824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42981ffb-a0e0-475a-8d78-ddb5ad9d618f/kuzirumalaloke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabd2a8b-5a2f-447f-9a3a-bb7c83f116ac/84946285610.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_off0000500a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500A 5008 bytes
SHA-256: c3c6ac9a2ed6ce7e35e32fda5601d714a29e5d0788e576cc87268ffa457bfa26
font_01_sfnt_off00006123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6123 10048 bytes
SHA-256: 5f5b08ab8733f91f6577b1126193f607e5aaec63654666462b9f73dc96e74117

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