Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a23d649ddd37400…

MALICIOUS

PDF

50.5 KB Created: 2020-08-10 08:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0c78b2cbf64d17d4b078abeb22f6c3a SHA-1: f046ff9cd3cff1d12842641845809a6a045f4ea5 SHA-256: 1a23d649ddd37400e71c2e99d5aba70577edc2687a75bbc4ef68f36e906d0cbf
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body also points to the same malicious redirector, suggesting a deliberate attempt to drive traffic to potentially harmful content.

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.ru/pify?keyword=microprocessor+and+assembly+language+programming+notes+pdf
    • http://durit.furbabygrooming.com/uploads/1/3/1/4/131406149/wumegatemexamoz.pdf
    • http://files.uchstimecapsule.com/uploads/1/3/0/8/130814129/zakumepiz-demawiwaxado.pdf
    • http://files.goodstuffprimaryresources.com/uploads/1/3/2/6/132681204/lamumolop.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/85472049926.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/36638253666.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/54287937193.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/mowuzedumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/74445720925.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/41760067861.pdf
    • https://cdn.shopify.com/s/files/1/0440/8881/9864/files/38669862095.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/limojafomibirodeluxajuvem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.pdf
    • https://cdn.shopify.com/s/files/1/0432/6146/0644/files/totetoxakipojilo.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_off0000865f.bin
35ae150fc45d4a8cee9b36eab6986e99c5fab16498d637c293f2bd84ff8b9d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865F 5724 bytes
font_01_sfnt_off000099d6.bin
5a8ebded586195ddc5f58ea166d82a77c89cea7f4604d466df203a16ced439ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D6 10148 bytes

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