Malicious PDF — malware analysis report

Static analysis result for SHA-256 831c8e09c30d1c9c…

MALICIOUS

PDF

72.0 KB Created: 2020-08-05 11:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 232eed78c5777e5d44a6a69593126d5f SHA-1: f9d205c72335ae782177fc5e10502faa2143bb5e SHA-256: 831c8e09c30d1c9c10f0a9d6842f4d905d7a99b46e38660c6f5c0e32b178ee31
194 Risk Score

Malware Insights

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

The PDF contains numerous links to an SEO redirector, which in turn points to various PDF files hosted on Shopify and other domains. This indicates a link farm designed to attract users searching for specific topics, likely leading them to download malicious content. 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.com/pify?keyword=insuficiencia+cardiaca+congestiva+tratamiento+farmacologico+pdf In PDF document text
    • http://files.theskinthatburns.com/uploads/1/3/2/8/132814967/loluwetojome.pdfIn PDF document text
    • http://files.gruffcorn13.com/uploads/1/3/1/4/131438137/9691198.pdfIn PDF document text
    • http://files.kaseimart.com/uploads/1/3/0/7/130739404/gixakeku.pdfIn PDF document text
    • http://files.obsidianrenewables.com/uploads/1/3/0/7/130776886/lojuv.pdfIn PDF document text
    • http://files.sarahmbarkleylcsw.com/uploads/1/3/1/8/131871778/polekuno.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/1/0435/4854/1079/files/brother_mfc_j435w_drivers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tazoxusejeko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/finivuzasukasunomepamuma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/nomokavesabarotumil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0511/6575/files/75221965407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/vovefowol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/world_break_season_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5792/9623/files/final_fantasy_14_act.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/wikiwaxutike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/vugobapire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/14815995784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/46956738353.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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 5472 bytes
SHA-256: 79a8a8498ad81242a5d4f152db9f9d11ff13934f56072b0d4f1ed165f1f29538
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 11324 bytes
SHA-256: 3a573231dde8824b6b019ac137a7267893721ef6a2da64d8046f4435049cf52f

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