Malicious PDF — malware analysis report

Static analysis result for SHA-256 f752199a6ed568e5…

MALICIOUS

PDF

44.3 KB Created: 2020-09-12 15:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 01c9c58abb1d2cdd622245ce7542fe97 SHA-1: 6a0d44beeba11fc1ec40d72fdee289a5d283f490 SHA-256: f752199a6ed568e588cb84195f42308891c31751b460098e13d85370acd10c1e
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to redirectors or link farms designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=toefl%20paper%20based%20test%20pdf. The ML classifier also strongly indicated maliciousness. 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/wb?keyword=toefl%20paper%20based%20test%20pdf In PDF document text
    • http://files.babylonboatworks.com/uploads/1/3/2/7/132740405/8615662.pdfIn PDF document text
    • http://files.nikosmarinos.com/uploads/1/3/1/4/131437615/21c52beae6c2e9.pdfIn PDF document text
    • http://files.doctorsparkanimalhospital.com/uploads/1/3/0/8/130813645/4469518.pdfIn PDF document text
    • http://nisowa.rubyrosecowgirlclothes.com/uploads/1/3/1/6/131636655/nizibafolufokudefek.pdfIn PDF document text
    • http://files.imagesbylk.com/uploads/1/3/1/0/131069819/dulaviwiketebawir.pdfIn PDF document text
    • http://files.forouryouthfoundation.org/uploads/1/3/2/8/132815791/7997533.pdfIn PDF document text
    • http://files.conscious-pictures.com/uploads/1/3/1/8/131871823/5215534.pdfIn PDF document text
    • http://files.christykiespertpianostudio.com/uploads/1/3/0/8/130873804/jinudakinex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a0f184f9bf4349768a38ab38577e1672.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cbe7f7_5621106d083d48bd94fb84eceee9d823.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8e66a5_990281a16f094f3ca2d10a04928ceb1d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0dd040_49dad87f72fa4435829b5ad77d7badde.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1be480_9c3c751c2ec940678fc2e2c4c3c05ba5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/35dc59_258b084b377c4161b326524d6c8e8a92.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2994dd_de0faa0455314114b2ff7453ed7e558b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/003b86_ecf162d519934935966d91b3994b4f27.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a382ee_6d871b3505e646bc84fe01d7ff446978.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_off00006d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D34 5124 bytes
SHA-256: 44ed341f9121ce5e4cc8639f408d7b8995091155c62af0dd5ed3b9d283951a6c
font_01_sfnt_off00007ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 10448 bytes
SHA-256: 51f8ebf9a82d7c020c0e31b7a4cdea71d7f7a0f551b5dfe1fb6bd28820a21fae

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