Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8d46e990731617…

MALICIOUS

PDF

39.5 KB Created: 2020-11-06 14:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 56ab56365d96727e42d24d6985d1c555 SHA-1: c80f77035dc8f0276dd3d64934b355bf9bfd6497 SHA-256: df8d46e990731617de9dcbda16d528c3726915cc21da24f6ea7ac56579be0b7f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm structure, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=d+d+materials In PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/1949949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8bc117d7380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f8bd0e325412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/16-3_the_process_of_speciation_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/ba_first_year_books.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/951-504-9742__-9295.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/business_plan_for_lawn_care_startup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b553a37-7aed-472f-9ea4-328210353850/mopezakerun.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/gimaralutiratopewavevil.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/73841005584.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/46797152605.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/44955611074.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/high_school_gymnastics_photo_gallery.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_off00005cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB5 4972 bytes
SHA-256: c50c44dd53aff6aa15c83736525a5857caa294e72bfb84c0a328fd561ad47425
font_01_sfnt_off00006d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7E 10636 bytes
SHA-256: 510e54b66ff17fef6494c9023d3bed760f413027d6ca1b5fda1ed413415c06b6

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