Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f4b389a9c412be…

MALICIOUS

PDF

37.7 KB Created: 2020-11-02 03:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-07-01
MD5: 8d0beff2664761b43e91fb8a3317c8e7 SHA-1: 006748ee78aa3eca5edebd5ae0f289a740f53192 SHA-256: a4f4b389a9c412be4ce8cd8daecbe2fb67da069a16ed7c255a8c197ba11084c7
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://gettraff.ru/123?keyword=flower+pollination+gizmo+answer+key In PDF document text
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/tipopimuzebumoj.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/sewosamitidosit-duvazupidez-serezususipi-furulujoresir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f98c0bdec719.pdfIn PDF document text
    • https://jalipixax.weebly.com/uploads/1/3/4/3/134340191/semimig.pdfIn PDF document text
    • https://jokepalebaja.weebly.com/uploads/1/3/4/3/134360350/segudabejilav.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/9544537.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005570.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005570.bin)
    • https://s3.amazonaws.com/fejififimaketo/jubuvusasajoputinoxunuxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1171/9335/files/android_destroy_and_recreate_fragment.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/41417601269.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/42054281291.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/nubokuji.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_off00005570.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5570 5400 bytes
SHA-256: f27bd8529a92c2a900592d6b80ad8494b1daa11c6ef1606eb6df4dc05a6c0783
font_01_sfnt_off000067e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 10156 bytes
SHA-256: 35d9264e0237cf92bdc8a0d5d5ce9bb91221500096ab5806fff396725bfe1d3a