Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96a81c2f29c7a27…

MALICIOUS

PDF

47.1 KB Created: 2020-11-07 07:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 68f88b2e6b46bd2bf6ecadc528c82ad5 SHA-1: 48469446d81f9b5b3929fb7bf053e6722f418f1b SHA-256: b96a81c2f29c7a27f18fa4a51df8bd76ff3368490ef2bb6013aaac7920d04856
184 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO manipulation. One prominent URL, 'https://traffmen.ru/123?keyword=tia+portal+v15+manual', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure.

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://traffmen.ru/123?keyword=tia+portal+v15+manual In PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/da0366c694e301c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fa09096b3a69.pdfIn PDF document text
    • https://rivatuvimib.weebly.com/uploads/1/3/4/4/134469475/2f6f589f.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/zigudimot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f8d53b35c856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_5f9ea58d9bb38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8c3e70b50f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f903f6d5816e.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/6b51298d-99d5-401b-a79c-5dbb2240667e/40303087227.pdfIn PDF document text
    • https://guzurelezusa.files.wordpress.com/2020/11/zte_handset_usb_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50304a62-47e1-4744-acc3-85e439455923/i1100_series_scanners_scanning_software_kodak.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/367424550.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/lafoparilo.pdfIn PDF document text
    • https://wixipozi.files.wordpress.com/2020/11/participe_prsent_et_adjectif_verbal.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_off000078d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D9 4972 bytes
SHA-256: 56156896539156f663df84499cc91728551ac7be040a501ea572ed9c21fdef33
font_01_sfnt_off000089c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C2 10800 bytes
SHA-256: efb9280bf6cda1cc75c924ffee2ca4e4e2c424e79b3f3b0ae209685c782bde33

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