Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a4492aba8de519…

MALICIOUS

PDF

46.5 KB Created: 2020-08-13 17:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 862d84fc059c7a7910ef4b46d2ded985 SHA-1: ab555b7ee84b1f77ae8169497d40899b18444263 SHA-256: c9a4492aba8de5194a4298018738ad86263cb96ae141c0a301fa6ddab7e54ad9
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large collection of external PDF links, suggesting an attempt to create a link farm or distribute content through numerous domains. The presence of the malicious redirector URL points towards a phishing or malware distribution scheme.

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=statutory%20arbitration%20pdf In PDF document text
    • http://rubodet.mowaxdiscography.com/uploads/1/3/1/4/131437709/febumibidokubiz_gogepuler_jarewepa_pomapoji.pdfIn PDF document text
    • http://files.erinboake.com/uploads/1/3/1/1/131164452/e7d45194fa92c.pdfIn PDF document text
    • http://files.preservemanhattan.org/uploads/1/3/1/1/131164156/1e9e823a175b9.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/1/0431/7016/8986/files/noxamomisoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2860038855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/gumakojuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6720/9883/files/ethical_considerations_in_secondary_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9419/4843/files/megoriki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/detosibemovevixopenuvalam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/diy_parts_washer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/81314822522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/68525604700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9886/9653/files/schwing_stetter_batching_plant_cp18_spare_parts_list.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_off000077ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 5168 bytes
SHA-256: 6ed60665b4c2864ed0be21bbdea5c22492033a97b0972adce7ff0c84702d8549
font_01_sfnt_off0000896f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896F 10624 bytes
SHA-256: 87714d04ee5aed4506ffc60f33017f72c780b99a2cdb72c629d182a4c8963121

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