Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8d2cf222f3ebeb…

MALICIOUS

PDF

43.0 KB Created: 2020-10-29 13:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a0ed1c674e9aa7199d1c7b71a38ea58 SHA-1: 84f0c47f803feb97f151edd5284ad7138224ec80 SHA-256: 3f8d2cf222f3ebebfb15779d78cabf0b5418da2fd1570c2b20a23e01355e6eff
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 link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body text, though partially garbled, includes the URL and keywords suggesting a lure for a classified ad. The ML classifier also strongly flagged this PDF as malicious.

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=armoire+for+sale+near+me In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f95b54d9d4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f882e3ccb45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5f89eeee5f04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5f90074fac391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f8bd5d69739a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87c7aa19dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f93b3a822b04.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/bevarolimesale/biology_textbooks_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439ea21c-306c-4582-a30b-06a840a6b188/16117831760.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/33561143254.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/jamixuvunara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af5f248-a067-4c1b-bc97-30e09cf9da75/sagorafelonixufitaxagodi.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/ielts_reading_assessment_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/66025368924.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/93619214729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038fc430-a331-47a9-9305-345591817420/27148421785.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/arcadia_quest_inferno_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/sugar_cane_alcohol_ecuador.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/17151807347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e3636e-8f62-4a75-92dc-ad683154ae04/numerical_patterns_lesson_9.5_answers.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_off00006a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A33 4904 bytes
SHA-256: 65dac13bc1482f7711e555c97366e2db66c494f0fbb6cba81a685a5cde94213f
font_01_sfnt_off00007ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC8 10972 bytes
SHA-256: e52b7b4e2967623356bd666d464e44392db395f16aeaf9d3ef2751910963a4e7

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