Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6982976244e0f4…

MALICIOUS

PDF

38.0 KB Created: 2020-08-19 01:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102588f4b4bba8de2a816038d15cab87 SHA-1: 50d5d448457af6e50163f013f982cfac59f77691 SHA-256: 1d6982976244e0f476ee557791af5d080748754c2e9b492e35083da366bb90d6
160 Risk Score

Malware Insights

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

The PDF contains a lure suggesting a 'Chrome os update' and embeds multiple links. One critical heuristic identifies a malicious redirector link (https://ttraff.cc/pify?keyword=chrome+os+update), indicating a social engineering attempt to lead the user to malicious content. The document also features a link farm, with many links pointing to PDFs hosted on Shopify, likely to obscure the malicious redirector. The presence of a browser extension/update installation lure heuristic further supports the social engineering aspect.

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.
  • 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
  • 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=chrome+os+update
    • http://files.georgecaldwelljazz.com/uploads/1/3/0/7/130775245/2c2644.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/99814297888.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/86292288889.pdf
    • https://cdn.shopify.com/s/files/1/0449/2450/2171/files/computer_networks_a_systems_approach_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/1941/0335/files/99958340719.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4001/files/38979245050.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/32375405454.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/abraham_maslow_motivation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/40741657323.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_off00005903.bin
2bfcdc3ca46962bbe35baa558b9ca4460e76eafedeb0f5c416418f5ddd83640e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5903 5072 bytes
font_01_sfnt_off00006a14.bin
54cf93e9831e1f2cc79e196306d53b544cfe71a629823026e1ce9e5861f4aa55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 9856 bytes

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