Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1af298cf6be57fd…

MALICIOUS

PDF

57.9 KB Created: 2020-11-09 07:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bf0b766f9706fa888e264ad4292b5dea SHA-1: 53943ed82fc00df5876141677cd83df814257bcd SHA-256: b1af298cf6be57fd57aadb4a46a85d6eb880a1c487da05c375cfe07311d4f231
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous external links, with a primary URL identified as a redirector likely used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=gizmo+student+exploration+osmosis+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f99a6edbe99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_5f9e7e41e832e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5f9b41b10c34f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5fa51a90afb23.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/69177442919.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/dbq_vietnam_war_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5fa12eb994cfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zoniwika.files.wordpress.com/2020/11/zezinejivapigewuxus.pdfIn PDF document text
    • https://tinomev.files.wordpress.com/2020/11/reteje_compaero_mason.pdfIn PDF document text
    • https://rebozowenopo.files.wordpress.com/2020/11/xibosud.pdfIn PDF document text
    • https://jodivikubo.files.wordpress.com/2020/11/cours_anglais_grammaire_conjugaison.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 1

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_off000099db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99DB 5512 bytes
SHA-256: 9338e84ef7049de4c3d530acd0b1f3be978d0345179f558c4374935ac57ec6cd
font_01_sfnt_off0000acb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB0 16572 bytes
SHA-256: 1d1472c0cad841c361a1e04404006acb3be6851b80a82b57eca58a7c9ceccb5f

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