Malicious PDF — malware analysis report

Static analysis result for SHA-256 4503807745af5bf0…

MALICIOUS

PDF

78.7 KB Created: 2020-08-30 06:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da5ef694aec0ac3bc41d06c73ada4d77 SHA-1: ffc71b75fd441c722e973ae561e7a47e919cb229 SHA-256: 4503807745af5bf0e8312a502106c2a18806599dcd34a2816b75f89bbd2e4583
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=metodo+boo+pdf'. This indicates the document's primary purpose is to redirect users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making further analysis of intent difficult.

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.cc/wix?keyword=metodo+boo+pdf
    • https://static.usrfiles.com/ugd/b8c837_6266bfeccb6f4ed397cebcdb63f6a4ad.pdf
    • https://static.usrfiles.com/ugd/b98abb_9c34c900c92d431d8b41c902cc120461.pdf
    • https://static.usrfiles.com/ugd/4bb894_7aaaf46dedf54f339955de167b86bf20.pdf
    • https://static.usrfiles.com/ugd/5cf23b_2d62301f1ba8478695fe08de9bf3cdbc.pdf
    • https://static.usrfiles.com/ugd/b4a829_9aba1985e82c4cddaaf3f170005796f4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/nonvalvular_atrial_fibrillation_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/kotukuxot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/xumobenugit.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97a4c2bb7ae48c3aba4fe4fdf46d109.pdf
    • https://static.usrfiles.com/ugd/822ecd_23b832cad58145d59f07d19faa751432.pdf
    • https://static.usrfiles.com/ugd/aef5b7_50210d3e671e46e290e47ac343cd8478.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb2.bin
d7f78ea085b2cd34c52908db3bcd34dd89fb6f9cf060397251f4dc01177190bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 4664 bytes
font_01_sfnt_off0000fdb4.bin
37da6bce24d2c744e9b41061b618cf20ee6fdba06489936ae9513b469ee8e607		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16228 bytes

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