Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9158d9e519d1595…

MALICIOUS

PDF

38.6 KB Created: 2020-08-07 22:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3fab2bad5651ae8095e4ee59001090c5 SHA-1: 552f418349b7dc413d54c8a22574f8ce9cd2bb3a SHA-256: c9158d9e519d159500389f4817f77c32f27158b58d2515589ee72bade175d341
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Acca f9 study text pdf 2020 bpp' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm SEO strategy to distribute the malicious content.

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=acca+f9+study+text+pdf+2020+bpp In PDF document text
    • http://files.smarttournaments.com/uploads/1/3/1/4/131438464/sogus_wonozafibo.pdfIn PDF document text
    • http://files.icewaterrecovery.com/uploads/1/3/2/6/132681670/4845144.pdfIn PDF document text
    • http://xexabeza.1872platbook.com/uploads/1/3/0/7/130738914/1573219.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/64238793182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4636/2523/files/vazetubowawekoxivojavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/sasogeratopiguvuronos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/lanthanides_and_actinides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/72075130319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/posadege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/duvevugamidalopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/81282924591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/pefumofogen.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 4

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_off00005669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5669 5752 bytes
SHA-256: 49037641dc6d1b1361e8ac5e3805b5035b0fe4bb5af044f55809cc4042b5713c
font_01_sfnt_off00006a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1D 10444 bytes
SHA-256: e7c205ee28f4767ab728184ff08baaa2359f7a658bfe7a111e2c94c10e1d158a

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