Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b1b3278d977222…

MALICIOUS

PDF

41.0 KB Created: 2020-08-07 06:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2638f42a7a83d8e04f6548fd786514b SHA-1: 28a7646d64a9e6908e58bf8b03453d1f0df026b8 SHA-256: 90b1b3278d977222b2b5f252949893927c98d6e97f58afab317d1f7295691bfb
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.com'. This URL is designed to redirect users to other sites, likely for malicious purposes. The document also contains a PDF link farm, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate a phishing or malware distribution attempt.

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=chemistry+a+molecular+approach+third+edition+pdf
    • http://files.natureandcultures.net/uploads/1/3/0/9/130969448/lidopevudum.pdf
    • http://files.danielacastoldi.com/uploads/1/3/1/6/131606211/2513356.pdf
    • http://files.briannashimerceramics.com/uploads/1/3/1/3/131381658/56e3f5b.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/register_nick_irc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/wemanuzopevagulewiwazeta.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6262/files/hcg_diet_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/55806585115.pdf
    • https://cdn.shopify.com/s/files/1/0435/7737/6936/files/adobe_reader_apk_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/66088753971.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/mass_effect_andromeda_voeld_vault.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/ferukusozisujaxoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/5810159707.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/mufaxenufomelapevi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/sisusalo.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_off00005ff9.bin
64cc51850497feffa9b7fe4490b4b3e08ae70d138b94442d6cd1e31302ed3fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 5404 bytes
font_01_sfnt_off0000722f.bin
4599ad45f64e9f4a2b709c59481277173a5338a462dbf8b72ba8efb0bbd1d391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722F 10352 bytes

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