Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e745c1fc8ac67d7…

MALICIOUS

PDF

41.0 KB Created: 2020-11-04 13:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7dcdbf0fb02e5806b429bf31785bfca5 SHA-1: 017aa646ec75198d4c81b3440480896f6654ca13 SHA-256: 7e745c1fc8ac67d714ea7644926a12567d334a9a74b49be82bcd7e99d0f9a361
124 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to known malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially obfuscated, contains a URL that is also present in the list of extracted URLs, suggesting an attempt to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.link/123?keyword=manual+for+neatdesk+scanner In PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/5f8fa55b6.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/domomusoladefif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5f92d95865e21.pdfIn PDF document text
    • https://tebokatesax.weebly.com/uploads/1/3/3/9/133999418/6768091.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/konafozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f9167b93c216.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/mipijigesa_poziwene_togozeguw_jafenodunuxusog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fa1fc2685a12.pdfIn PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/2165051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86f95fa0ed9.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/8755400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/32490271692.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/texte_religieux_pour_bapteme_catholique.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_off000062f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5084 bytes
SHA-256: c99e2a0c3815b290a714b63a2dc2622d431d356a4213ddb43f32ed3524a1b6c3
font_01_sfnt_off00007466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7466 10400 bytes
SHA-256: a8f949aa0770979ab103e5996bfdefaa00afb9c95e23d34feef1deee265b311e

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