Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f7a53f9c0204e0…

MALICIOUS

PDF

67.8 KB Created: 2020-10-01 15:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6a7b46b33cc14a55656fa4318144b66a SHA-1: 0bfd4c29fac52185f890b474e05e8365e1f55773 SHA-256: b1f7a53f9c0204e049e233eefc900c6965993e49d911d3c27a8278e41f6ed376
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting, designed to redirect users to malicious infrastructure. One such link is https://gettraff.ru/strik?keyword=neoclassical+theory+of+management+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting a phishing or scam lure.

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://gettraff.ru/strik?keyword=neoclassical+theory+of+management+pdf In PDF document text
    • https://site-1039156.mozfiles.com/files/1039156/93308089191.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/32071789034.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/dudibikejix.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/dajamukowexew.pdfIn PDF document text
    • https://site-1039390.mozfiles.com/files/1039390/11493008382.pdfIn PDF document text
    • http://vegex.allseasonscreenrooms.com/uploads/1/3/1/6/131606490/modojitebewe.pdfIn PDF document text
    • http://files.apocalypse-party.com/uploads/1/3/0/7/130776324/557fb96dea5e0.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/7fcabe31-ae44-4ec3-932c-152fb707875b/92416656008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ce2bb3-f31a-4dc1-98ed-f12768152bd4/99517996520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12b4396-bf27-4646-9dbc-8e063dda1478/95787254798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abe079d-d179-43d5-9445-f08406ae526d/46916678649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b12e096-76fa-455e-8845-f8cf4726bf89/latebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3c7829-8e30-45a7-bd0f-f73f7bad49a4/59955608947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25d9175-c577-4b39-a471-02767b4a5d7f/gowokekulimeliwetikiw.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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 5640 bytes
SHA-256: 17dd6b1377c544301a6a98b6da2200a1aad53ac79ddb9704e7983f6a13492925
font_01_sfnt_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 10328 bytes
SHA-256: ed3a8ebbb4f17e79995695a5b2baf38f33a7075ab3e981e03dc189f54ec42c68

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