Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8af1316b9db27c…

MALICIOUS

PDF

46.1 KB Created: 2020-11-02 10:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: bfc5eb5d3edf552a73199c9796f6e976 SHA-1: 0c23f49b2bfb46be0954ae76d1cdaab61ce31d48 SHA-256: 2f8af1316b9db27c68ba4110056050007917a44f66b05f0ad81e8a3a6d40eaf9
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://cctraff.ru/pify?keyword=dowling+football+game+tonight In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f9c877110e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f8751249b861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f902f2e86a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f911a6335522.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/dibopi.pdfIn PDF document text
    • https://s3.amazonaws.com/betimugi/jesus_calling_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007639.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007639.bin)
    • https://uploads.strikinglycdn.com/files/f0aa2e8c-a671-470e-b379-f18014044115/51297571533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6664/4384/files/palaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b30eae-e987-4368-8634-1746a95b5ea5/kiwaxanef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e54f45-eb9f-42f5-9db4-b6166b78e806/minogopawek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0e0b92-7ed9-4237-bc43-0a8b60173369/3433172631.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 extracted file (font_00_sfnt_off00007639.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 5140 bytes
SHA-256: 8c3c8e7c831598e5c5acfa572e71ff431bbfb6453926d975ec0e7799a2a59c24
font_01_sfnt_off000087b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 10712 bytes
SHA-256: e649e974ab8cad9293b272c0ef2bae94759363efd52aa22dcecd53e87990c94e