Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca844a90f76963d…

MALICIOUS

PDF

39.4 KB Created: 2020-11-05 08:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f3f5ab9a385a4bc91a271d72597ca7b9 SHA-1: 6cab55ced596df930ef809874e9d9d3e342a349b SHA-256: 1ca844a90f76963dd0d48ad7bd3e49842efcf84ea68f58edf7832c7f9af6fdf2
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. The document body, though partially corrupted, includes text related to a lesson assignment and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=lesson+3.1+assignment+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5f94bee3b0938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5f96fe2fcae66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f91752f834b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5f9582b77357c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f87c06700420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f93e403caa2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5f923a5669dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5f9b2b96c6635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f99dbabb8873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fa387478c39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5f99612a62fdc.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/3657e1f1-f0f7-4fe0-bb03-3f7749443a88/27991754672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6eea94-e32f-4972-95ec-f33bb7d866a6/mega_man_11_all_bosses_no_damage_no_items.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/55020811116.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_off00005bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFB 5252 bytes
SHA-256: 214bd8b85e7a6b5a7c79b2720890ba224b707ec4133b1d0934d38f9dce894db3
font_01_sfnt_off00006de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 10504 bytes
SHA-256: 5541dab238488cb8a967792464c2c2157c50110784ac55588ba3257d03427cc6