Malicious PDF — malware analysis report

Static analysis result for SHA-256 218c3cd4230969bc…

MALICIOUS

PDF

41.3 KB Created: 2020-08-01 07:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 225b868fabc498d222685679492500d7 SHA-1: 2c92a559481f14f10bcf02c1f694769e405eef01 SHA-256: 218c3cd4230969bc825eb1b92e461594c0ecc78ff31e5688d8eaa4d0748d841f
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary malicious redirector identified as https://ttraff.ru/wb?keyword=toxicologia%20ambiental%20john%20duffus%20pdf. This URL is part of a link farm strategy, aiming to lure users to malicious content through seemingly legitimate but ultimately harmful links. 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.ru/wb?keyword=toxicologia%20ambiental%20john%20duffus%20pdf In PDF document text
    • http://files.faloonaagency.com/uploads/1/3/2/8/132814958/30892.pdfIn PDF document text
    • http://files.slsareascouts.org/uploads/1/3/0/9/130969830/287d92604.pdfIn PDF document text
    • http://files.ktskinandbeauty.co.uk/uploads/1/3/2/6/132683292/9bc203e.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/1/0433/0687/7080/files/94766401197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/61289911590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0190/3264/files/88748124578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/49124943647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5253/8773/files/gmc_topkick_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/tufexipemofewumafotexuxon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/honda_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/84431927414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/beloromawodosuxaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/xukuwogigikox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/29744548635.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 6

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_off000060d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D5 5704 bytes
SHA-256: cd71e8da147c0c1bfb9696158f641ef464835d7ffaf94f94b6527679d8671836
font_01_sfnt_off00007428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 11380 bytes
SHA-256: fd84e0cf173c4a30a253340411887647479458dbc7b632d76b709c36f8383d82

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