Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd0ec412d6f31d7…

MALICIOUS

PDF

34.7 KB Created: 2020-09-15 03:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0218929b53c97ad07d4ff9a81fe3c751 SHA-1: c1cf6744383df9cb8b088c75dabae4048465554c SHA-256: 7cd0ec412d6f31d7379aebcb02ea740b04ec03d712b9ab19e757fe589d26889c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to redirect users to malicious infrastructure. The document body also contains this URL, along with numerous other links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt. 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.cc/pify?keyword=jefferson+county+traditional+middle+school
    • https://cdn.shopify.com/s/files/1/0434/2802/0373/files/20455826175.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/4204134507.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/97623905849.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/nct_127_regular.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/chemie_formeln_zeichnen_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/brain._fm_cracked_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/7568/2972/files/krups_espresso_coffee_maker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/dinosaur_template_mask.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/nivewedoxovapanamoti.pdf
    • https://static.usrfiles.com/ugd/e32576_307796c4691248e59c8b82e62c871b68.pdf
    • https://static.usrfiles.com/ugd/d90490_2eb7f1ef01204030badccf1ffce8a11f.pdf
    • https://static.usrfiles.com/ugd/a91264_d17b3b1d00284f1e94cf42b1da1dcb9d.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_off00004a42.bin
aea904fc30ed1ab817620f7055746e811ed40c57ecfa70734978292103d0faa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A42 5352 bytes
font_01_sfnt_off00005c4f.bin
2d33dfc167ca4c34acdcac178787104083b0cfd60e9d0235ec30e7f0a3aba75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 9812 bytes

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