Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5b2b38fd55c30c…

MALICIOUS

PDF

64.8 KB Created: 2020-08-05 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 20c6de19218fd1ac32ca2b6843cb4199 SHA-1: a2646d2d87bd76632ea84e5071b4d3108e70d5b6 SHA-256: 4c5b2b38fd55c30c2f5519878787efcda4b32342ca3f5224ef128e8e6d695be4
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector (ttraff.cc), indicating a potential phishing or malware distribution attempt. 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.cc/pify?keyword=application+octet+stream+chrome+pdf In PDF document text
    • http://jasevu.kipreschool.com/uploads/1/3/1/6/131607712/jetuzebogesikirokak.pdfIn PDF document text
    • http://files.urgasconouranimalshelter.org/uploads/1/3/0/9/130969368/1353255.pdfIn PDF document text
    • http://files.doverfirst.org/uploads/1/3/1/3/131398542/wexoxisuwin.pdfIn PDF document text
    • http://files.devereuxreach.org/uploads/1/3/2/3/132303270/pafexunipizom-gezajo-norigegasozike-takuzajemuziroz.pdfIn PDF document text
    • http://files.wanderwellfitness.com/uploads/1/3/0/8/130813095/xojenojafepel.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/1/0433/0687/7080/files/77330784460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/subject_verb_agreement_multiple_choice_quiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/9456/1188/files/waste_to_energy_sweden.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1227/5871/files/learn_git_branching.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6501/5460/files/83305492948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4810/6134/files/79850433277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6371/3695/files/jasozabowavepez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/denawafateluniserudozenuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9756/8920/files/lagemijuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/duguradolafebusopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9179/files/zoxaxuf.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
🗂 Part of campaign: staccounting.co.uk 3 samples

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_off0000af0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0C 5384 bytes
SHA-256: 260eff89c20f9cc62429313116b4fd5a988b7b053aef53a67a6f695b7d7446ec
font_01_sfnt_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 17020 bytes
SHA-256: e13b399c7ebf404f72400bc3f72fe5d8514b4d7809eeecce5f1d8681c086b37a

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