Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbe48cb3f6126ac…

MALICIOUS

PDF

43.8 KB Created: 2020-11-04 04:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8dbc67af4aeff052c09c2384376dcc6e SHA-1: d6da7df32d9af781d79d8de7f354831a79962f19 SHA-256: efbe48cb3f6126ac3969cec73c350bfe4e099357630a4ad0777868afd2ceea7d
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=constructivist+lesson+plans+for+math In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5f9fa6c841536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f890a792c6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fa1e5b9054f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f873e679c4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871f98c2a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f9b1f7a401cb.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/83158a83-7e73-4bce-ac9b-b27f6f016755/34724279472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6616d2-46ab-49ea-9121-e1813a6c846b/76899747153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0dded14-7add-4e20-b69a-26d0515a037b/free_young_family_nudist.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_off00006d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2C 5220 bytes
SHA-256: 7f66641a5bc56bd23fa604081d050b291cc831d85a18b99669bb988269e09589
font_01_sfnt_off00007ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC6 10736 bytes
SHA-256: 3926aa151c10e6579e08e04b8c79bc8a2ee82ce79536218bd88a968b72733f4e

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