Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf9c105961d16be…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 04:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e3bcd63d6908d64ea171382ccaa583cd SHA-1: 70ac64dacfe55cb3eb0bcae7fa5651a8f154ec61 SHA-256: 4cf9c105961d16bec4e089329222b2e01509427109890a22fd708162ffe0d2f2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains references to the same URL and a large number of other PDF links, suggesting a link farm designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be a lure for users to click on malicious links, likely leading to further compromise.

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=adobe+indesign+magazine+template+free In PDF document text
    • http://files.hawerabaptist.org.nz/uploads/1/3/0/7/130739155/2740111.pdfIn PDF document text
    • http://files.birthto5partnerships.org/uploads/1/3/0/7/130775350/jobezomesabir.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/1/0433/2240/9125/files/lirizejovekuzefejazozer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/35931195726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/mamukikuzidevolugikare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0832/6812/files/kogesifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/cursive_alphabet_writing_practice_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/17737392058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/einfache_bruchgleichungen_aufgaben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/zulilex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/tezugasumajulufuvusanaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/jatefesibegexasejazot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/83533849333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/rolidofapizikaxavifibopi.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 3

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_off00005cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC6 5540 bytes
SHA-256: 78eac6d57d0d23eb4e6d4eaf19f8731c23e7142e95808bffc3cfbd1228e3d039
font_01_sfnt_off00006f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F82 9796 bytes
SHA-256: b1f192db80bc9c4961c86848746ebab8ecaa1e5a7e853da2d6a999891f1ca914

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