Malicious PDF — malware analysis report

Static analysis result for SHA-256 51beebb8b42438bb…

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 01:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f62501c32414cc4da371e10f2fd86341 SHA-1: edecba166a647b4be6976316f838f52f030de605 SHA-256: 51beebb8b42438bb589e783a32d0c46fcfb9ba4699592f7026ff7f105248eb19
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a PDF link farm, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is designed to funnel users to a collection of other PDF links, likely for SEO manipulation or further malicious redirection.

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/pify?keyword=makedonsko+devojce+sheet+music In PDF document text
    • http://files.innovativelearningservices.com/uploads/1/3/0/7/130775866/2e518f64d.pdfIn PDF document text
    • http://files.globaltimberinc.com/uploads/1/3/1/4/131438397/eea54716c8a1c.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/1/0436/9717/6741/files/ccna_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/16425920877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/zupobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/rojoxusuzumufiwititumorix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/vebobimenifudemilunega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8442/2051/files/sophocles_antigone_fagles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1916/4058/files/97775077308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/39641673369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/wow_classic_deadmire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/excel_formulas_with_examples_in_excel_sheet.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 2

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_off000050e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50E6 5256 bytes
SHA-256: c2d9080840a052e4a914ac1930a39f121e1fbf7011d1be30e0b2da7739da0be0
font_01_sfnt_off000062b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B3 14748 bytes
SHA-256: 039103cd5c13c9455649b05d1730ae2924c595df7d4a6133cd18c99230fd6368

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