Malicious PDF — malware analysis report

Static analysis result for SHA-256 6400f135dc1e5b6d…

MALICIOUS

PDF

33.8 KB Created: 2020-08-12 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9275aaba9651a11d51828c9b06f5a498 SHA-1: 05e3c8c26e22efe25ce3c0ab0748d8fa60c4f222 SHA-256: 6400f135dc1e5b6d477acb94f20dd0a21b69ac9c3b37d5d8e87e79a4c2eca3ad
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious URL, identified as a redirector for SEO link farming. The document body, though heavily obfuscated, contains text suggesting a lure related to an "urban regeneration handbook PDF". The ML classifier strongly indicates maliciousness, and the PDF is flagged for linking to known malicious infrastructure.

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/wb?keyword=urban%20regeneration%20handbook%20pdf In PDF document text
    • http://files.775marketing.com/uploads/1/3/1/3/131379183/6129823.pdfIn PDF document text
    • http://files.chzaz.com/uploads/1/3/1/3/131398419/2276526.pdfIn PDF document text
    • http://files.livanisbehavior.com/uploads/1/3/1/4/131437005/c3aaa3fb2.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/1/0430/0174/1463/files/3449098588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/talimujefudujovejotob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/balada_para_adelina_partitura_piano_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/62180171523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/73702886242.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/29859826873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60527157158.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/62168562732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/8805907190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/toligubuzogojime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5981/3279/files/75361606055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/xajupumabekenomudifelagut.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 3

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_off0000488b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x488B 5288 bytes
SHA-256: 3614799378eed9084c84115b688134a7a78a0b85c539c8b744b215fc388e6fc9
font_01_sfnt_off00005a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 9308 bytes
SHA-256: 3c35580db34eece8d681eba2adfd7c66a0efded926d3db3615e1e07a331e4b62

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