Malicious PDF — malware analysis report

Static analysis result for SHA-256 c213d511a4f36cad…

MALICIOUS

PDF

39.2 KB Created: 2020-09-10 02:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 963a40b2a41a983f0eb1245e4ddf9b6b SHA-1: 99d85a7df41cd7e01c277ae77314f9af1602fa1b SHA-256: c213d511a4f36cadfa3d3bab63fe308e2607c038853e6de3940d4a6e0c50cb10
234 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link T1566.002 Spearphishing Link

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a social engineering attempt. The document body text, though malformed, suggests a lure to install a browser extension or update to view content. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ttraff.link/wix?keyword=kerboodle+practice+questions+answers+chemistry In PDF document text
    • http://files.thefrontpaige.co/uploads/1/3/1/8/131871698/jisila_sasufosasu.pdfIn PDF document text
    • http://files.littleempirepodcasts.com/uploads/1/3/1/8/131871625/mitelef_vobamaki_butabuveb.pdfIn PDF document text
    • http://tonow.oldschoolsailing.com/uploads/1/3/1/6/131606295/zonijitekojo_xasonitamet_gilapuzenilekev_muraf.pdfIn PDF document text
    • http://files.trainingsolutionsinternational.com/uploads/1/3/0/7/130739180/xeluwif-genop.pdfIn PDF document text
    • http://rirukoju.heronbrookhaven.org/uploads/1/3/1/8/131872269/0d7f4b2881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/227d0f_f70f187ae0454643aa799152bd20f84d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_115a7a9572aa4889834bfac29b25440c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ac0094_b9a59f05be414a0eb34f61ce9dfe81b3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_527e1dd520674f53a0cf9c4579a140c3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/345929_3d264f545c4546e8afc9fe1c446dc5f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4725f1_9cbae7a6a20542ea98d4953ce7850681.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a640e9_55ca4ff30d794d9ebe2ff035d987c4dc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/565485_0887695b4a6a48d3992e10e0718f8097.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57BA 5740 bytes
SHA-256: 4338cee35997a41170454668094c9c953c02b1ed5c388417b6cd9155ec192333
font_01_sfnt_off00006b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B28 10276 bytes
SHA-256: 56b2d9bf260e5e6d4a82a35992bb9b351e99117f281f67ee37d73db87abba429

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