Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bf8f6d9315cf0c…

MALICIOUS

PDF

39.3 KB Created: 2020-11-09 15:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f40b7c59b2014a9c11206855f2664d53 SHA-1: f2826abc5411c617d4b2b501b49e0f93a93f285a SHA-256: c1bf8f6d9315cf0c1520dcbbbeabf6a392229367b23c7caf3b3edbbf7afb5dfc
134 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/aws?keyword=hacks+for+medieval+warfare+reforged In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5f91591e620a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5fa21f556eaa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f926b8b2edda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f8f779ea81ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_5fa5ae79d6fda.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/346c1d48-9ec7-44bb-8a91-04c9b3088483/46366539643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcdd8af-4f3a-4d08-9a54-fd580512c614/kingdom_hearts_style_drawings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6050a8-dafb-485b-9207-69237df7e4fb/guzimekokewowadijorazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fc0ab1-fca2-4592-95be-d81b278689b3/21609075005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e028402-51cf-4b6b-b58e-c25a3eb42b3a/toxesukikabopafalaluji.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_off00005716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5716 5520 bytes
SHA-256: cbe5822411e14a300692e3964eabe4190b7f03b2332359bf46133116552fa543
font_01_sfnt_off000069da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 11572 bytes
SHA-256: d0a89f0e08e8daf37aec808503ac6c9fb1a869e0a87dd5144597929fcb59fcbc

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