Malicious PDF — malware analysis report

Static analysis result for SHA-256 592ae2b94a462c60…

MALICIOUS

PDF

67.9 KB Created: 2020-11-03 20:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ee477a497a5a74f4bae7c2a1fe457d32 SHA-1: 1df0adacb1b45c5e316ef62223eb1d94d4cb9c64 SHA-256: 592ae2b94a462c60a7fe5bc59f90ebb7bc13053d651ecd5e67eaa8a328ccca5b
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=piriform+fossa+mass'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery.

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=piriform+fossa+mass In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f92b487f35d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f907eec62e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5f96dc53473f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f9607464a5f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8ef023065f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f9f02f7f0105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4cbd09c3-5928-485a-949b-f353aeaf49db/xudufuzidebalimas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ac5bd8-d723-4009-8a44-991e192f3ea6/77849621134.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/wacky_walleye_guide_service_sturgeon_bay.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/xamibofevad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996af049-7981-4679-a5c9-93438385b0b2/bescor_mp-101_modification.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/problems_of_inter_ethnic_relations_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae4ba85-8ea9-4278-b8da-c5c55e0fbb74/wuwekuzixeroxozavanulovam.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/free_online_timers_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/polarity_therapy_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/mamadaxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E7 4368 bytes
SHA-256: bb97a795a49f99aa7c26b506c59502e02d9de0bb137af7f3ebac217d00250af3
font_01_sfnt_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 10520 bytes
SHA-256: f9080a6ab5a144d54df9e94df29fbc726d4529762f677d9a587730f5d1a8a542
font_02_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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