Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ad501b1c304824…

MALICIOUS

PDF

40.2 KB Created: 2020-11-09 08:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 517310812966b49fe33dbfdca6da3286 SHA-1: 28da624c563cb9bf028f9328257670afd0403f64 SHA-256: 28ad501b1c304824ac60a07a366a70bbef262c45f79b6fbbf595300ee31f0d86
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/123?keyword=graphing+practice+biology+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5f93b84451613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f9dbf182a47d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_5fa4f5c01e861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f997b5d86022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5f9519758e8ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_5fa40b61835bd.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://s3.amazonaws.com/henghuili-files2/nibamagipaxojapadag.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/action_and_linking_verbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/unblocked_games_66_at_school_shooting_games.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/tarrant_county_sheriff_inmate_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a230dcd-e951-4c64-9dc5-639ae93b4966/i_was_sober_for_an_hour_now_i_m_roll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522051c8-e5e0-4c64-8a13-fb807131c4b1/klondike_adventures_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/virtue_ethics_and_professional_roles.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/campfire_popcorn_popper_instructions.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_off00005175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5175 5412 bytes
SHA-256: 7707062134e3a6e657730564929864fcea95cc0800bc8ba9aa83ae0885418cab
font_01_sfnt_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 9892 bytes
SHA-256: b85533eb5e96c97a90d592bf5614e65f44256fd9495263e0fe24e41bb3353e70
font_02_sfnt_off000085b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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