Malicious PDF — malware analysis report

Static analysis result for SHA-256 633b4503734fe2b8…

MALICIOUS

PDF

34.9 KB Created: 2020-08-01 10:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b904a54fc4bb1b0793c4d4eb9a2f1576 SHA-1: ed03a9b9f75a9f8c73ac5b2c87d60787d18ef86e SHA-256: 633b4503734fe2b821e0351cd908f8a50cb1332361cfbbf30578df0029843ad7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text and URLs that suggest a lure for free downloads, likely leading to malware. The ML classifier strongly indicates maliciousness, and the presence of numerous links to SEO-optimized PDF hosting sites reinforces the phishing and redirection intent.

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=victor%2527+s+piano+solo+sheet+music+pdf In PDF document text
    • http://files.ecosureuniversity.com/uploads/1/3/0/9/130969077/tiboxomon-xosujuzozen-sosob-muxazakalupola.pdfIn PDF document text
    • http://files.nicolebrauchart.com/uploads/1/3/0/8/130874633/1590447.pdfIn PDF document text
    • http://files.foresightencyclopedia.com/uploads/1/3/1/4/131437504/pexefukigazidiwoj.pdfIn PDF document text
    • http://files.rustedchrome.com/uploads/1/3/1/3/131380171/b2f6ecd09d21e.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/1/0435/3694/1215/files/58568412389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/modapuvesozijusotejas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9906/8318/files/bijirod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/kekukofojekusujat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/disiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/xowipexezajokolola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/teteritamazixoliguju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/wefoxaxunividogup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/87314562451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7013/6230/files/93990137629.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4461/6864/files/kinikalukigenazirawen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/4334832734.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_off00004907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4907 5392 bytes
SHA-256: cbcb10fc7e80514e1d08bc8ba525839d2840f8ec763237755ca2129609e57613
font_01_sfnt_off00005b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3F 10420 bytes
SHA-256: dda3ebf9292cf30c97022f5416a9aebf8dac2186d410cc75f33e80f9237b501f

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