Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e694fdf3dff59a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 21:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 225fd9b0bb29deb0b74f9bb2663b152e SHA-1: a03091313e3b1c7d6e35a5d001d613d6c9729be9 SHA-256: 13e694fdf3dff59ab536b1900c56750543ce9018b8e0a8ef569f60513f15bb8a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to create an SEO link farm, directing users to a redirector URL that is known to host malicious content. The document body and heuristics indicate a lure for a free PDF download, which is a common phishing tactic. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=brunner+and+suddarth+s+textbook+of+canadian+medical+surgical+nursing+pdf In PDF document text
    • http://fapat.npyouthcenter.org/uploads/1/3/1/8/131871980/ebbfc05e4a.pdfIn PDF document text
    • http://gezozekes.garnerfarmfresh.com/uploads/1/3/0/9/130969060/dexik.pdfIn PDF document text
    • http://fulexubap.chartwellprimarymaths.org.uk/uploads/1/3/0/8/130874329/xapim_fonujozusojok_juvakopijedo.pdfIn PDF document text
    • http://files.steppingstonedaycare.nl/uploads/1/3/0/7/130776619/8020035.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/1/0432/2630/0577/files/piviruwurire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/boxofitimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/vesitisovivituvedeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/69036216727.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/75796566257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/33255411465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/34148224805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3638/5175/files/97958639726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/9823991896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/sql_export_to_csv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/zejibunizusufutosutinev.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 1

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_off0000621a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621A 5892 bytes
SHA-256: 9ef2b962ec6d8081bd4c85de9688d326dae240f1573fee24c657f25c048d978d
font_01_sfnt_off00007605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7605 9932 bytes
SHA-256: 27920c3a0fe7cff852f9ac8911bc4e38c48077cb403560022509841b87d5c455

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