Malicious PDF — malware analysis report

Static analysis result for SHA-256 8525d654cef5a234…

MALICIOUS

PDF

40.6 KB Created: 2020-10-05 03:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8e370d795798151503f8582f99808c5e SHA-1: 7a8f1073c5a931b0d33d0be2ffa350dd37d7cddc SHA-256: 8525d654cef5a234e7eb343ad605c9e76c4c9e5d9fe97f3446ef21a4f2b8d102
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=class+10th+sst+notes+pdf In PDF document text
    • https://site-1039743.mozfiles.com/files/1039743/11142565607.pdfIn PDF document text
    • https://site-1040256.mozfiles.com/files/1040256/gasovagewuwa.pdfIn PDF document text
    • https://site-1038525.mozfiles.com/files/1038525/28560555359.pdfIn PDF document text
    • http://jofixefud.myleftlane.com/uploads/1/3/1/6/131637140/8677647.pdfIn PDF document text
    • http://widajufi.depthstiny.com/uploads/1/3/0/8/130814579/jajuvabegojenoj.pdfIn PDF document text
    • http://files.thehanssonlab.com/uploads/1/3/2/7/132710753/dekagefuz.pdfIn PDF document text
    • http://files.theraceshack205.com/uploads/1/3/0/7/130739489/fukanulufisilukaxen.pdfIn PDF document text
    • http://files.jg3xperience.com/uploads/1/3/1/4/131452811/jetivekofige_jebisi.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/c326d48b-e390-44e4-b0fa-3b19fe1c1c1e/58113808611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92518a65-f969-4fe8-8f01-3700a43c15fb/pufefidena.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_off0000618e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618E 5132 bytes
SHA-256: 2be897801148e4d92d345625f7a4acca6ae360a0cb96ededcf0da1a6ad437bdd
font_01_sfnt_off00007303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 10236 bytes
SHA-256: 1e438c021f4caea63f140ac100991be7c50640aa02c2a8c6e3a37a69e38747eb