Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4ec0cfaafbd4d5…

MALICIOUS

PDF

56.8 KB Created: 2020-08-03 10:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d7ae54535ae8711d89238423addb01ce SHA-1: e01e469f653d9a46c6f5d4e9a6a2de895a034c27 SHA-256: 4a4ec0cfaafbd4d586f8431047036b0af016545e64e8cdbdcc851bc144c95ac6
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to a medical PDF. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector link.

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.cc/wb?keyword=abdomen%20agudo%20quirurgico%20pediatrico%20pdf In PDF document text
    • http://files.jazzmenmusicandgallery.com/uploads/1/3/1/8/131871740/637d7.pdfIn PDF document text
    • http://files.drawinguntohim.com/uploads/1/3/1/4/131406749/588408.pdfIn PDF document text
    • http://nigabuzuj.villageveterinary.ca/uploads/1/3/0/7/130776088/7066324.pdfIn PDF document text
    • http://files.zeydarsantana.com/uploads/1/3/2/6/132682585/varusidosoxa.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/1/0432/2754/5757/files/zalolojunemipirabofenum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/98026592884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/69171668442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/guvegasase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/30203052402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/venunosukefiloz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/39605468525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/ketamarakupixerikin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/32642217288.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_off00009cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB7 5520 bytes
SHA-256: 800192a125a16ee1105033dc59d90a7a241cf9a0df58699f925bcc4655e8300e
font_01_sfnt_off0000af5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5B 11920 bytes
SHA-256: da3057b42ca6779ad0a697ae4abd81b2778fdbf19af3fa9e30d1d5518cf90d29

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