Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf616713f0c677a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 09:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 02a0b1679e90e9b29caf9cc6a2b8ae50 SHA-1: 28701e8d67845ac1d575cbba677501a7da6c1102 SHA-256: 4bf616713f0c677a684dea2ddb00a2217f92df57958f345b0bbad2b537a65ef5
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a school Ofsted report, aiming to lure users to a potentially harmful website. The document body and heuristics indicate a link farm strategy, with multiple embedded links pointing to external resources, one of which is a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=cringleford+primary+school+ofsted+report In PDF document text
    • http://xajizido.reddsocialstudies.com/uploads/1/3/1/4/131482952/moxita-wegobu-jafaxujosumoto.pdfIn PDF document text
    • http://files.stoutheartedhounds.com/uploads/1/3/1/3/131379037/48826c2a.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/1/0433/4272/5275/files/exercises_lateral_epicondylitis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/wovofomonusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6778/2808/files/canutec_ergo_2020_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/graco_king_airless_spray_pump_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5050/8181/files/gugatizufunuxogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/47879822818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/31080836437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/75309925221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0257/4494/files/nivasimedunajumenewodisuz.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_off00005846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5846 5576 bytes
SHA-256: 46e6cf88c1840de82730853f0bd0f6be210e734b66768fc77a5fbeb22e5751c3
font_01_sfnt_off00006b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B16 10380 bytes
SHA-256: 1f980684bfb8a70ff18e187276235709bcbb0a5928a13e29cf66d7c9823c6dcd

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