Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4613e84a935fb0e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-17 14:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4eaa0f8738c7cadf2a4db9fa40e9d40f SHA-1: f6468eace282ff2f4ab8dfbabd0a9627a6c9f2db SHA-256: b4613e84a935fb0e078db79fa861e88af68492ec61fe45f2302a2777f89e153b
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, likely for SEO manipulation or to distribute further malicious content. The presence of the malicious redirector URL suggests an attempt to lead users to harmful websites. No scripts were extracted from this sample.

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=usda+dietary+guidelines+for+older+adults In PDF document text
    • http://files.detoncho.com/uploads/1/3/1/3/131383483/3938616.pdfIn PDF document text
    • http://wutajiz.good-neighbors.org/uploads/1/3/1/4/131453133/7546928.pdfIn PDF document text
    • http://files.bacalandersengarrison.com/uploads/1/3/1/3/131383319/vesoviwifu-duwakij-selugomapida-bemazanu.pdfIn PDF document text
    • http://files.platuworlds2017.com/uploads/1/3/0/7/130776735/volifovanazumixo.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/1/0436/8600/2843/files/nujopasudugutemotiges.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/wewoselikotasovizagaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/piwewikirazilet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/maths_formulas_for_class_6_to_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6942/files/occupational_health_and_safety_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2049/9620/files/cable_size_calculation_formula_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/1685/1356/files/wogojazixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/98259714055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/estudios_experimentales_epidemiologia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5868/3295/files/y-_intercept_and_x-_intercept_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/85201363116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/rukadifajoloxabuliweju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/blindsight_peter_watts.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 7

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_off00006115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 5168 bytes
SHA-256: 4343d732cd7972220a2655873051ad15fcbc540c48baa851e4c818b06e3ee2ab
font_01_sfnt_off000072c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C3 9984 bytes
SHA-256: 0fb4384ffade8b0f6ac2c3bb3baf79b5c4a53a890f46077bdae26b56da48aa78

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