Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af448758c31b0b3…

MALICIOUS

PDF

35.1 KB Created: 2020-09-29 22:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-06
MD5: 015e8a65fa5d3b4b5bfb3abc0bca925f SHA-1: 0befb30c190612c47d2f8f8491eb1fa8824f72a0 SHA-256: 4af448758c31b0b3485f7d07fc9c3ccd30f62dbb3510d9763f8b3752e4717f57
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://ggtraff.ru/strik?keyword=arduino+programming+notebook+pdf In PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/39559417788.pdfIn PDF document text
    • https://site-1037163.mozfiles.com/files/1037163/99913424840.pdfIn PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/5569058746.pdfIn PDF document text
    • https://site-1036686.mozfiles.com/files/1036686/fukux.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/81223260412.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/f32ba7f1-f115-4832-ad83-9f39a2e3c4de/65851931061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699f002c-d22d-42d6-ae17-8da477e4d278/gopajuvoxuseruvoxowuruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3fe576-9737-4fbc-afd4-1e4c0c7b2865/54239008069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08c1124-e5e3-4417-a33e-eee9a061fc04/kugamusofowuzilux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bcdbb1-b5a6-4b83-a5b2-00ea9d1f65ba/45267135484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/39494864621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5438/9665/files/81088231099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9634/9602/files/sample_aptitude_test_questions_and_answers_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0559/1200/files/sowosisofarozewitoripese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/33850146170.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_off00004a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A05 5344 bytes
SHA-256: ce816964f3d97ace0f8828d72340ca1e26de433001830e719d1db90b27e28fb0
font_01_sfnt_off00005c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C24 10584 bytes
SHA-256: 443190f5938263b84889a06a3c3516bce5c256ffe1a6b584437f874ad62e6f7d

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