Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d792a82f960081e…

MALICIOUS

PDF

41.2 KB Created: 2020-10-01 07:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1bddf7b052437e688000a544b3a79952 SHA-1: 3a083dd78c9657d23359e21acb6fa29a56937a57 SHA-256: 4d792a82f960081e1b99ba497dc42cda257b14ea7db09834d2da251459efd768
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links pointing to redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution, and are likely part of an SEO poisoning campaign.

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 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=layers+of+atmosphere+in+hindi+pdf In PDF document text
    • https://site-1038317.mozfiles.com/files/1038317/56057030379.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/45046684911.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/tatepuwomobudasizi.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/59825833109.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/maxejetugulobi.pdfIn PDF document text
    • https://site-1036671.mozfiles.com/files/1036671/nevakonuvadak.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/17508545863.pdfIn PDF document text
    • https://site-1038375.mozfiles.com/files/1038375/kudulizutur.pdfIn PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/52287729.pdfIn PDF document text
    • http://files.proyecto1867.com/uploads/1/3/2/3/132302913/mozolejemi-vexiramiga-leselu.pdfIn PDF document text
    • http://files.babyjawn.com/uploads/1/3/0/7/130776460/3831148.pdfIn PDF document text
    • http://files.jozibestwomensclinic.com/uploads/1/3/1/8/131857758/2aed4.pdfIn PDF document text
    • http://files.thrivingdrs.com/uploads/1/3/1/1/131163867/lawafebumaki.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/1b2740d9-6391-40a8-a83a-dd3f12f5736e/88497692706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df24383-caa0-418c-b361-5921470df8ed/sevuwubuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e1b98f-999a-48c7-95f5-4821d407052b/73055733355.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_off0000570d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x570D 5292 bytes
SHA-256: 15220dec759a28301b01ecdbf247217694867cfbfbd442356c784e2e4d6ea6ff
font_01_sfnt_off000068f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 15188 bytes
SHA-256: e56115304fd01b29a6364b1dadb30da9d5155c014be2dd4e7c8d3bcce3e45d6d

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