Malicious PDF — malware analysis report

Static analysis result for SHA-256 334d93a5ddb4fb08…

MALICIOUS

PDF

39.5 KB Created: 2020-08-16 12:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b62b90ebe61c8854ee299babe82ef646 SHA-1: ce3f2a98d24816e5dfafc672efb4f50b098c1ae9 SHA-256: 334d93a5ddb4fb08d7a57546c7835aac4b1f5dc7af5f1da1560f13776b7f9753
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=android+sdk+28+gradle+version'. This URL is likely used to deliver a malicious payload or redirect the user to a phishing site. The document also contains a large number of embedded links, many hosted on Shopify, which is indicative of a link farm or SEO poisoning technique to increase visibility. The ML classifier also strongly flagged this PDF as malicious.

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=android+sdk+28+gradle+version
    • http://bizatiwo.acaciatreecare.co.uk/uploads/1/3/1/4/131407278/4d0232e7d8.pdf
    • http://files.leatherlondonguide.com/uploads/1/3/1/8/131856234/1893753.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/bepidodaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9845/files/ashrae_90._1_2020_ip.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/dotaxeget.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/28822291854.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/wevixuvamejuwelafutusumu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/35525064129.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/wosegujifepanasopepegot.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/jilting_of_granny_weatherall_summary.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/sexutuvebixufekidepopev.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_off00005959.bin
ce2f165b0982221f8a41c40536eca63764f96df66447031e72738cdb41cf1b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5959 5432 bytes
font_01_sfnt_off00006be2.bin
10345cdc709c9d86454bdc6ebba6305059af7a16f830df54909feb9b152bf586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE2 11020 bytes

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