Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0be803420ecd36…

MALICIOUS

PDF

39.5 KB Created: 2020-10-07 01:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f0101a0e879b35a40a08f04cf4eabf4 SHA-1: 63270e9d91004e38a3d81b1e13e39f00dd3e41f9 SHA-256: 8a0be803420ecd36696c21acdb96446ec7738b41c3ded80b9d897b98280b8b78
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 pointing to disposable domains, which is characteristic of SEO poisoning or link farm abuse. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/pify?keyword=google+usa+site+only'. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to potentially malicious content.

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://ggtraff.ru/pify?keyword=google+usa+site+only In PDF document text
    • http://files.lincolncollegechapelchoir.com/uploads/1/3/1/6/131636947/wevox.pdfIn PDF document text
    • http://kexaga.tagtheartgame.com/uploads/1/3/0/9/130969060/sasegi-tabojedosakif-vutozutovenaxat.pdfIn PDF document text
    • http://sewemeduz.5dogsfishing.com/uploads/1/3/1/3/131378814/5552119.pdfIn PDF document text
    • http://files.fitzwilliams.co.uk/uploads/1/3/1/3/131398573/54cce7a3.pdfIn PDF document text
    • http://wekafi.kelliegrennan.com/uploads/1/3/2/6/132681590/8347539.pdfIn PDF document text
    • https://site-1038395.mozfiles.com/files/1038395/fuxivijakuz.pdfIn PDF document text
    • https://site-1043882.mozfiles.com/files/1043882/pewirefififugun.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/58513594197.pdfIn PDF document text
    • https://site-1040326.mozfiles.com/files/1040326/36558006597.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/43675755831.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/nenifodofupozi.pdfIn PDF document text
    • https://site-1039212.mozfiles.com/files/1039212/sulebadaxejuf.pdfIn PDF document text
    • https://site-1039268.mozfiles.com/files/1039268/43987429821.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/e10b97ff-6d8d-4df4-b43e-e000987fb6aa/sapabuwaxenazovulufanifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da256663-0732-4182-996c-fdf6c918fa41/kaluga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a689591-6ecf-4667-88d9-b11d5bab7e88/50717354497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da65ca5d-ad62-4b97-af9b-3cd6d13a4121/fusikofilawopebujane.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_off00005d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D89 4888 bytes
SHA-256: 49e3171b42df76c10530d416542697b599fd20bc8f2cc38827838465688b30b1
font_01_sfnt_off00006e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E50 10252 bytes
SHA-256: 760bcba3d8c974d319117e1f0246530c46c52fd750a975b04c8e8f60dc05866d

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