Malicious PDF — malware analysis report

Static analysis result for SHA-256 64493589af13e65a…

MALICIOUS

PDF

47.2 KB Created: 2020-08-14 13:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3b2e7d4f8bc6eff1f80b92fc76892a SHA-1: b9cd4b5d86f7a955d7660c91d4ff2657c80fca38 SHA-256: 64493589af13e65aa93752b5c912b0d81ab974a6c1fbe44270cbd7a701c454b1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains a URL that matches this malicious redirector. This indicates the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=conceptual+framework+for+financial+reporting+2018+revised
    • http://files.tmsapvo.com/uploads/1/3/1/3/131378950/pivojetexekigon.pdf
    • http://files.diluvioaz.com/uploads/1/3/1/4/131482975/juzugerizu.pdf
    • http://files.gannonjwattscounseling.com/uploads/1/3/2/6/132682022/7f8b22ff5febf43.pdf
    • http://badudasul.nourishministries.org/uploads/1/3/1/4/131452883/c40d91ca8ffa.pdf
    • http://files.nest-of-the-rat-king.com/uploads/1/3/1/4/131454316/6d86c7a657cd168.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1552/0935/files/kafivazi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4896/files/85286472691.pdf
    • https://cdn.shopify.com/s/files/1/0432/6594/9862/files/catherine_tresa_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/rivuxugitokodakezepaki.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/javascript_recursive_function.pdf
    • https://cdn.shopify.com/s/files/1/0449/8895/6830/files/hiatal_hernia_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/pdf_unlock_file_open.pdf
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/25774713173.pdf
    • https://cdn.shopify.com/s/files/1/0444/3914/2566/files/61437308595.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/38912601550.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/23272992576.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/libro_para_aprender_a_tocar_guitarra_clasica.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077e8.bin
ca91fd0dd239eff144ff03d85ffd082b1581f1a1b3dbd4a5f331d5e83443d60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E8 6116 bytes
font_01_sfnt_off00008cbc.bin
1d328bae9d598badc3ea01d655454c635b8818bfaa36c8c946e174d2c8f7ad9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBC 10024 bytes

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