Malicious PDF — malware analysis report

Static analysis result for SHA-256 663dbb0becfc3603…

MALICIOUS

PDF

51.5 KB Created: 2020-11-04 14:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 04693bf91ce8e27a0af65115b371358e SHA-1: dbd237acb255c35055af6ac02ae49c73a70d76e8 SHA-256: 663dbb0becfc3603c10ecccdaba3e736d4ef5ec8199769e9f72497ff42189117
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/aws?keyword=what+font+is+python+written+in. Although no scripts were directly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

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://cctraff.ru/aws?keyword=what+font+is+python+written+in In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5f99b57dbb701.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/2c24077adcf.pdfIn PDF document text
    • https://vizipelijokefar.weebly.com/uploads/1/3/4/5/134512389/ca4e13c.pdfIn PDF document text
    • https://xamalebudeke.weebly.com/uploads/1/3/4/3/134326767/1250206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f8ae7be345e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5fa1a90ac5f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f955344569bf.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/jiwisi/19659359522.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/lepalekomuwutolufasevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4007a2f2-783d-4eb4-9ff6-3d7a51cf9aed/96696704136.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/pokemon_hack_apk_mod.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_off00008b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B81 5164 bytes
SHA-256: 87f9fa91c0bf80e9461bbb7748ed3385d1812becb8c863e32742e8cdec7347b0
font_01_sfnt_off00009d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D30 10500 bytes
SHA-256: 55823d9dd5b8ce186b0d5ec786a4f263e0ee6e5fe35c6227fde773be8c0b67f3

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