Malicious PDF — malware analysis report

Static analysis result for SHA-256 351f70ad312c91b4…

MALICIOUS

PDF

45.0 KB Created: 2020-11-08 15:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ecd1c68a6646833ea6ee1ce3dfe4968 SHA-1: 189aacff914699accadfa6f8e2e1d914b986a935 SHA-256: 351f70ad312c91b4c6320a756e5dc0a56b6bf3e8b3d30bfc06b19eac088722e1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites, potentially for phishing or malware distribution.

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 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.
  • 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/123?keyword=piedmont+region+georgia+climate
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f94adb096cb7.pdf
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5f97891624f24.pdf
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5f915f71d55f0.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f9a4be5eb685.pdf
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f8d8928dec55.pdf
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f92272485916.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5f97b6d6a66a4.pdf
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f8bc7416763f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeroguru/bear_grylls_pants_for_sale.pdf
    • https://s3.amazonaws.com/lorifumofelu/2020_calendar_with_holidays.pdf
    • https://lidevan.files.wordpress.com/2020/11/fortnite_limited_edition_founder27_s_pack.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000720c.bin
858f7d3af5846c66b630d67665c00194657254a554d14b6a8e5ed2808702c767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720C 5080 bytes
font_01_sfnt_off00008338.bin
20906679b26c6de48372d3d73db58f61f98f2db3fa4a9e779e54fb48b1d093df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8338 10660 bytes

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