Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d7abac8791374d…

MALICIOUS

PDF

35.6 KB Created: 2020-08-12 19:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c468ba4a4e2bab48bd7108f009573b3a SHA-1: e334f6ce596205327afd285ccb02b44692aac950 SHA-256: e4d7abac8791374de7f41dd2b531922b9d07933bcba6006a45a70332183fcadf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link farm designed to appear as a financial accounting solution manual, but the primary link redirects to a known malicious domain. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this redirection. The ML_NYX_PDF_MALICIOUS classifier also strongly indicates malicious intent. The document body is heavily obfuscated but contains the malicious URL.

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/wb?keyword=financial%20accounting%20volume%203%20solution%20manual%20pdf In PDF document text
    • http://files.antigonekoutalieri.com/uploads/1/3/1/4/131408572/gonijugagoba.pdfIn PDF document text
    • http://files.clayshootingdevon.co.uk/uploads/1/3/1/4/131452841/nawuzibusados-nimoru-feriwubebexej-teput.pdfIn PDF document text
    • http://kupeki.kozal.net/uploads/1/3/0/9/130969060/ragupiralexikitaga.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/1/0429/6343/5679/files/sakekemisuvigorever.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/48629419480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/65938877647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6743/9259/files/basic_electrical_and_electronics_mcq.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1325/0972/files/examples_of_organic_and_inorganic_compounds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/44111779487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/zaloxobire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/41038117614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/libapuzepurudavababanotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6558/0437/files/general_mathematics_textbook_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/86241001513.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/effects_of_water_pollution_on_aquatic_life.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_off00004b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B22 5556 bytes
SHA-256: e6e33d01a1f8b306fe6984619c87b2c13bf4c221ce9520188e8e4900f9aca148
font_01_sfnt_off00005e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E04 10308 bytes
SHA-256: 86a9078c037525ac392689aae6a35a2abc8d46493f74d3c9120a926b5fcbb84e

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