Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dd60700a4cf62a…

MALICIOUS

PDF

39.9 KB Created: 2020-08-15 22:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 46a0afcdeea0502ba60318b2d8ca171c SHA-1: 8b56335599ee926fb98240fe717783d17cc65f9c SHA-256: 91dd60700a4cf62a6f2eb4a44f33e99bd7dcfdb20f4a4ccc98e851f10bad8f1e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. The presence of a link farm heuristic further supports the malicious intent of directing users to potentially harmful content. No scripts were extracted from this sample.

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://ttraff.com/wb?keyword=nonlinear%20analysis%20theory%20methods%20&%20applications%20pdf In PDF document text
    • http://files.kaufman-law.com/uploads/1/3/2/6/132681596/3779e1f8.pdfIn PDF document text
    • http://files.katemanne.net/uploads/1/3/1/6/131636957/681c66827f78b4a.pdfIn 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/1/0429/3050/3846/files/54553985153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/cv_format_for_civil_engineer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/wawubakobomaxixog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/44619235942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/45665410370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/bliss_point_economics_optional_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/nunivubopizitunuvenep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/vopujonavukilunoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/39587905278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/30630114099.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 5

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48A4 5136 bytes
SHA-256: 78768405f048ab4db5086261bc4f31a15d9f81985d8afac30075e664a7416017
font_01_sfnt_off000059ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59EE 10972 bytes
SHA-256: 074619b6962badd7951838a0d28b7f1bed3dee0817b140a60b0718055533a4e3
font_02_sfnt_off00007d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D76 16132 bytes
SHA-256: ccf879661c26e8d85a43d4fcfbba60320246430dcbf46b047d24072eb45b37a5

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