Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf235decf016bd0c…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 23:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5c9448c7cf3202d704a11feb9bb4693b SHA-1: 4d62eacc402ffebe42fbd7709cda99c824bf2165 SHA-256: cf235decf016bd0c980d5e7c06b278bf5b48b82ff2b39279ec87808d75b5e43e
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 a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs. The primary attack pattern appears to be SEO poisoning or phishing, leveraging a large number of links to potentially malicious or deceptive content.

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=animal+cell+culture+masters+pdf In PDF document text
    • http://files.iwritebookspub.com/uploads/1/3/2/8/132815806/3148142.pdfIn PDF document text
    • http://files.necsema.net/uploads/1/3/0/9/130969525/fiwawilenag.pdfIn PDF document text
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.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/1/0432/8764/2270/files/cultivo_de_arveja_plagas_y_enfermedades.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/80125890238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9121/3990/files/43766463586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/pimobot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/kuwosobuxovafifudokok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/83145161179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/waxuzegafikefenoxiwebedag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2204/7638/files/photoshop_free_trial_forever.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/fenorodat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/lizekisululavizisoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/64100433323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/manchester_aquatics_centre_pool_timetable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1251/4204/files/d_d_monster_manual_3._5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5344/9365/files/46928742688.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_off00007263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 5288 bytes
SHA-256: 4f4b594169088c2fc85f689ff0fadde8f2abdfc68f90b5488aac2b19422a6a88
font_01_sfnt_off00008443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8443 10020 bytes
SHA-256: 0fb8807b2fae43a97622a8af9d7b586f4574a79e658685aeb60ca81905018165

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