Malicious PDF — malware analysis report

Static analysis result for SHA-256 5223d26be2d48b56…

MALICIOUS

PDF

38.7 KB Created: 2020-08-17 15:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f633c64a3e43046c1bf2bdcb174fbfe8 SHA-1: 0c8da1b92d142904677a30b9d7d5eeca77aecc71 SHA-256: 5223d26be2d48b560d1b832216c0a41ce68d6c8da6ab6d7a1152eccb13e9be7d
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though partially garbled, includes the phrase 'Windsor park middle school ofsted report', suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, likely to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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/pify?keyword=windsor+park+middle+school+ofsted+report In PDF document text
    • http://files.artsstudentsassociation.org/uploads/1/3/2/6/132682646/labenes-warinog.pdfIn PDF document text
    • http://files.inibus.co/uploads/1/3/2/7/132711966/pavagu.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/1/0434/5757/7122/files/kitijesulas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/67494717567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3846/4417/files/zibowifitewowewadib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/68732941967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/definicion_autoestima_psicologia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/vowenesadituboba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/beminum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/36525531178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1493/0084/files/shannon_wiener_diversity_index.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_off00005873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5873 5472 bytes
SHA-256: a797dc13643271aceb1ca2fd0a5f5a77e277e9dbff2729452edb8a9c9baef405
font_01_sfnt_off00006aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEC 10388 bytes
SHA-256: c4c968648e742fb1b8dfd6607948b4c8216bb3282de1db1948b304721e1eec50

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