Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1be12fa9d5daee…

MALICIOUS

PDF

35.7 KB Created: 2020-08-28 03:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a080d70349aec76c6af912113cd7cd98 SHA-1: ead390b38dc14713fd60bc4bbd6d0882eca27781 SHA-256: 4c1be12fa9d5daeeaf3a3b4bb199448634ad7209a64e388117592f309cc079e9
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=eye+of+the+tiger+sheet+music+for+bar'. This redirector likely serves to obscure the final destination of the malicious content. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on various domains, suggesting a link farm or content distribution network. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=eye+of+the+tiger+sheet+music+for+bar
    • http://files.jahc2020.org/uploads/1/3/0/7/130739239/8188241.pdf
    • http://files.breakthroughathlete.com/uploads/1/3/0/7/130776265/4a68c8ec847.pdf
    • http://files.journeyagtorrington.com/uploads/1/3/0/7/130740465/f22929bb1008.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/medical_fitness_certificate_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/2971/5354/files/xigolusozoguselinekadov.pdf
    • https://cdn.shopify.com/s/files/1/0464/5260/5096/files/vaxatasubosev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/appsc_group_2_new_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/math_games_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/inorganic_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/windows_10_restricting_speed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/xepakaneveb.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/wikuxiku.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/rupobaxusonavavaxefononan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/gixep.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_off00004b05.bin
d334aa48210c59d570be27b18101982427eb3e61d936e78b14165e3e6999a687
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B05 5464 bytes
font_01_sfnt_off00005d8b.bin
93b6ff115cedf8dc5a745d7a0f8b7d6a2964fcabc8d3cb9af7526069950dbca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8B 10648 bytes