Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ba790e31c66b9…

MALICIOUS

PDF

45.3 KB Created: 2020-08-05 14:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 53ab9f27a2ed3c6c2ae5f5df4cedee86 SHA-1: 5b54588de3e53117ef239af226a6fb93093945a4 SHA-256: da2ba790e31c66b9dad3cd26830136232ad8af0a8d356feea0fb37d594e0367c
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=theorems+corollaries+lemmas+and+methods+of+proof+pdf', is designed to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other PDF links, indicating a link farm or redirection scheme. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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=theorems+corollaries+lemmas+and+methods+of+proof+pdf In PDF document text
    • http://files.valetridents.com/uploads/1/3/1/6/131606260/2994862.pdfIn PDF document text
    • http://files.davidmartinsstyle.com/uploads/1/3/2/6/132682471/2414572.pdfIn PDF document text
    • http://files.someday-l.com/uploads/1/3/0/7/130738850/ba78a.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/1/0434/6917/6985/files/71619107247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/junakolabepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/rarifudo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/arachide_dfinition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/81275092659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/gogewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/pufevufogafotaxor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2158/3004/files/can_t_download_from_google_drive.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABA 5344 bytes
SHA-256: 813550ace9b3c15a5cd73b7c293f82aed9eb11405a90165fd6623cf312de5445
font_01_sfnt_off00006cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 10352 bytes
SHA-256: 14a9e3468c613151b16b01911238f3da5d47a08078d73c48b5f2da653b8af8f3
font_02_sfnt_off00009033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9033 16780 bytes
SHA-256: cf82d832016c7908a6e90583c4ba59dae85b18f5b13a4ac42a4bc5a843ed4ef6

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