Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ef9a1ebdc8bb3a…

MALICIOUS

PDF

48.9 KB Created: 2020-07-19 21:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1faaaaff99e1cf400d17d50f927887e1 SHA-1: 5dfcd443994865828d97bf60232048247c4f491f SHA-256: 85ef9a1ebdc8bb3a0d60c2720477b4a55f96f0a8b8e30dccc5459d237ae99065
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links designed to redirect users to malicious websites, masquerading as a geometry worksheet. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms the intent to lead users to potentially harmful content. No scripts were extracted, but the document structure and embedded links suggest an attempt to exploit user trust for phishing or malware delivery.

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.ru/pify?keyword=geometry+proofs+worksheet+with+answers In PDF document text
    • http://files.amselectric.com/uploads/1/3/1/3/131379134/topagijoxod.pdfIn PDF document text
    • http://files.volusiaschoolcounselors.org/uploads/1/3/1/4/131453559/puvononufuzezekuvuni.pdfIn PDF document text
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdfIn PDF document text
    • http://files.theazphoenixsoldiers.com/uploads/1/3/1/0/131070604/gujolezenofotidexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lorirosoxaxe.files.wordpress.com/2020/06/vozasuwotuvime.pdfIn PDF document text
    • https://vovuzugola.files.wordpress.com/2020/07/42548709242.pdfIn PDF document text
    • https://tuxukem.files.wordpress.com/2020/07/pudowogiperotigug.pdfIn PDF document text
    • https://maforebe.files.wordpress.com/2020/06/kosisab.pdfIn PDF document text
    • https://dinipexus.files.wordpress.com/2020/06/koninomulelukawarasozasuz.pdfIn PDF document text
    • https://zazizoko.files.wordpress.com/2020/06/83203434730.pdfIn PDF document text
    • https://lililizita.files.wordpress.com/2020/06/91574521061.pdfIn PDF document text
    • https://xejolaxutibu.files.wordpress.com/2020/06/peragidaxajemukagi.pdfIn PDF document text
    • https://kapavefewo.files.wordpress.com/2020/06/68555239148.pdfIn PDF document text
    • https://ximajisifije.files.wordpress.com/2020/07/tovavelagisojaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/74369123112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/katepozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/60016419066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/xurinosikepomuvewobama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/lalunor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/lesamegokolizoxufalax.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5188 bytes
SHA-256: 9f4a66f709b20b41b13aa1200e9571437a8a32126392311b3b79c0695b4b4234
font_01_sfnt_off00007d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D12 10324 bytes
SHA-256: ab4719014c67cdeaab20b69930ca1eff07883387782faa01cdf1df51e84bb196
font_02_sfnt_off0000a085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA085 16168 bytes
SHA-256: b2ac67756ccb9a38f0303b1ba820cb5c8b4ab6133599e7fd07ad9e712984a954