Malicious PDF — malware analysis report

Static analysis result for SHA-256 18319607f3df5afd…

MALICIOUS

PDF

39.6 KB Created: 2020-08-13 07:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 33217e36fdc48d09371de6db7c4a4109 SHA-1: ea0f12e4933abe74b9feea5c5e0db27efc0fb0f0 SHA-256: 18319607f3df5afdda4c63a30ad0bd9a7286d15a590c575328f36318324060d7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains multiple heuristics indicating malicious redirector links. The document body, though heavily obfuscated, contains a URL that points to a redirector, likely intended to lead users to malicious content. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=free%20halloween%20word%20search%20pdf In PDF document text
    • http://files.babybegreendiaperservice.com/uploads/1/3/0/8/130873820/vurajopefupal.pdfIn PDF document text
    • http://files.lamosproductions.org/uploads/1/3/0/8/130873717/1a7b7e1baac280e.pdfIn PDF document text
    • http://bibakurob.dmcihomesinc.com.ph/uploads/1/3/1/0/131070571/jotizupabuvozalowofu.pdfIn PDF document text
    • http://files.erasingculturalgenocide.ca/uploads/1/3/1/6/131636978/rolewugusi.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/1/0436/3635/9326/files/4888794705.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2446/3525/files/vamigatilix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/38330916437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/94754830588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/gurutupemivajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/dokod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/26017715993.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51851907441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/bimuxepasozufazol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/fagen.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 5

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_off00005c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C18 5292 bytes
SHA-256: ca348b32be6fa8d1646819976c715ab676087ceee5543b74b25182b61d5cd58d
font_01_sfnt_off00006e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 10416 bytes
SHA-256: 263e19f825cdeafc0da8d9d37ef5108abf2faccde0444a33c3116f223aef2270

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