Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba5b42421096dbb…

MALICIOUS

PDF

30.8 KB Created: 2020-11-04 15:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 97ef55ced21cf2a3e119b90def9c5853 SHA-1: 15857fa18f69c4f3e27b5db7549e1c80f0f96e2f SHA-256: cba5b42421096dbb7e0c43bc7d7e59cfa66056074315af8745c6cbd03a12986a
134 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically designed to lure users with terms like 'gtrac login army'. This indicates a phishing attempt, likely delivered as an attachment. The ML classifier strongly supports the malicious verdict, and the redirector URL is a primary indicator of compromise.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/aws?keyword=gtrac+login+army In PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/e4f9439fd5b50c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f930937a968a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5f96f7e54c90a.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/bedokupet-folekawaxixij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5f9fa9833b61d.pdfIn PDF document text
    • http://www.gcss-army-portal-access.com/tag/gcss-army-loIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/sizetitoloxovozobobaponer.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/app_to_convert_to_word_docx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba813eb-0e70-4642-af42-640184a5c896/34837744073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac339025-389d-4d9a-b1c4-8dd50dfdec6d/realidades_3_workbook_answers_page_51.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/nubokuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061e9904-d3cb-4dae-a988-fa825a6ed6fa/mejexiwesusewemopumas.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/pisofedavavulizumajejux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c37205-1c18-4d37-8207-bab7c927cec8/sawofoj.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_off00003ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EC9 5072 bytes
SHA-256: a0703d64292b54b9d94029abcd2edcc10e529d7f44fdd602200155521f17ee23
font_01_sfnt_off00004ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFD 8964 bytes
SHA-256: ef58348f2c23f9912b8a2c344a3d5182bf98719dbf45ef3bfe2f1bde9138971f