Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ecf90c35167456…

MALICIOUS

PDF

35.8 KB Created: 2020-10-03 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-21
MD5: d024d8ded63ac1fb35245fc61386afac SHA-1: c71d558871246ae3f01cccbea4a9e67dba5733cd SHA-256: d3ecf90c351674569beae6ab1e74ac2cbb4c0afdcf141948d829d0ff68184aa1
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/strik?keyword=singular+and+plural+possessive+nouns+worksheets+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/empirical_formula_worksheet_ap_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/18154901316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/kezuturuvilogevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5834/4348/files/56674679925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a2dab3-4378-41a0-ada0-001198e057a6/nidenitanibonevazune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acff4360-802f-4a5a-8d94-a1e6ceea1192/dovod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b120efea-a35f-48bd-ae89-b445301452b5/lolademuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9b946e-0223-4a9b-af27-81b2d78353bd/sagevut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98e6852-a87f-4797-9290-c932e4027345/zemaxifiwafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8dd5ba-1da0-4058-8bdc-241b6cc8fffc/nujagizewaxufiwejaliwazex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e505e2-c4be-43b3-8aa1-d48c1896869f/15624502260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/40140290646.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/juzubodowalisin.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_off00004b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B42 5624 bytes
SHA-256: 7f02b932e7171e90a76ee62f1ed193bdd6ead731936a8809a6ce42460be41a6e
font_01_sfnt_off00005e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E75 10524 bytes
SHA-256: 3edb4aef66581b96a84fc455000e69d7ad6c8ce0de40e0dfbbfc1d306f133ab8

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