Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3491dbd2bcbae6…

MALICIOUS

PDF

47.2 KB Created: 2020-09-30 09:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0c5162fcce366f3845816626f582d921 SHA-1: 7f520b0474ad866d0094bc774ee6886e6ac48b8d SHA-256: fc3491dbd2bcbae6a2462d76898b7712dbeb2838a0af42fbbabdbadb088e8134
124 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the one identified as malicious. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent.

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://ggtraff.ru/strik?keyword=psychometric+test+sample+papers+pdf In PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/898686514.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/varovi.pdfIn PDF document text
    • https://site-1037246.mozfiles.com/files/1037246/9368947161.pdfIn PDF document text
    • http://bogomi.yoghana.org/uploads/1/3/1/8/131858685/mogojugasu.pdfIn PDF document text
    • http://kamifimiw.artworkskenosha.net/uploads/1/3/1/8/131857590/pumiguratasi-zobenajalipo-jasofofasevala.pdfIn PDF document text
    • http://reter.transportation-planning.com/uploads/1/3/1/3/131378776/9692584.pdfIn PDF document text
    • http://nolar.daliajade.com/uploads/1/3/1/3/131384306/1832379.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/80604526799.pdfIn PDF document text
    • https://site-1036742.mozfiles.com/files/1036742/71484919944.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/10ffb372-bcf2-4cdf-af21-b46ebfe76010/gapaxuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef212ba-efc4-4a7e-992c-f7ee9d0cbf4a/12403920223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0440122-e073-4a94-979d-5365e4601173/283771252.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_off000079e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 5496 bytes
SHA-256: 7166be11b5d0a581983cc5b559f5c9ea37c2f057f81518531c5d9d9f8b92d657
font_01_sfnt_off00008c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C75 10424 bytes
SHA-256: 639be9fd0bcbda4bbe531013e748f95ed661968b9339eff2d519ef6a94560323

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