Malicious PDF — malware analysis report

Static analysis result for SHA-256 440a59175e2306fa…

MALICIOUS

PDF

42.1 KB Created: 2020-10-31 00:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5a3cd31a18b871a5cd07de476d4066a1 SHA-1: d55eb47657c08314368fe8f1c1327ac05828538d SHA-256: 440a59175e2306fa291c71b072b1fee4a7703c6291b6bf84455ac76d84a8bb9a
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://cctraff.ru/strik?keyword=bdo+increase+family+fame+fund'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains embedded URLs, reinforcing the likelihood of a malicious redirect.

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://cctraff.ru/strik?keyword=bdo+increase+family+fame+fund In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5f94becdbe29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5f97c117befda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f960248369d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f9be6c1737de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_5f9c3b5ce24d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f872a9bb7495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f8b6c5ba793d.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/zeworibuzoza/23733622658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90d264b-7fdd-43af-adc2-4dabae0f8777/dogo_argentino_rescue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d36350-e758-4e83-a525-4c5e8875d78e/65667908150.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/neoplasia_maligna_gastrica.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/30572467629.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_off000062bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BB 5316 bytes
SHA-256: fe073d81bc1a50614c7af2bc42d6359f72d3aa0f6bf95d203adb7a80f02a5c92
font_01_sfnt_off000074c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C5 12068 bytes
SHA-256: 9d93daee14584f55c6064211077de27f77b680c896edcf4f7b07338a1654c936