Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddf58941fd2aa14…

MALICIOUS

PDF

42.3 KB Created: 2020-08-13 21:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7067c46b63b3248e478b93684578ff0 SHA-1: 7b49dbd3e2304897a62a9f977ea99daeacb4910d SHA-256: 5ddf58941fd2aa14ffdb30d555cb918fcc84fe0e06a69b82f19c2d848c155e46
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, and employs a social engineering lure to trick users into installing browser updates or extensions. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the embedded links and the lure suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=google+chrome+for+android+dark+mode
    • http://files.romancewaiheke.co.nz/uploads/1/3/1/4/131484133/4526697.pdf
    • http://files.ucbclaaofsd.org/uploads/1/3/1/3/131398515/cadc008d8af1.pdf
    • http://files.ballaghbotanicals.co.uk/uploads/1/3/1/4/131437601/70194d71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/47860634584.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/dujimenamo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/jomejumuro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/776241757.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/toxis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1236/5211/files/92858626759.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/96853841540.pdf
    • https://cdn.shopify.com/s/files/1/0435/0322/2944/files/mubaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/65036758924.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/ethiopian_grade_5_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/university_risk_management_plan.pdf
    • https://cdn.shopify.com/s/files/1/0438/3558/8770/files/blending_in_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/65312511213.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_off0000664e.bin
5877b58e783b96d6a209ba901e703b30b46c2ccdf988c0ba2d3ec4b1a9d7a994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664E 5352 bytes
font_01_sfnt_off0000785c.bin
f64d0b24e68b226df7d93a2a5a936e60e943704938ebab00d793127482ce6057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785C 10572 bytes

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