Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f972ddcea83a13…

MALICIOUS

PDF

46.5 KB Created: 2020-08-22 19:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf2b6f57708fd576417139797414cd53 SHA-1: 1dbb8d36f46fa2d60e0c8687e71aaa387d1ae051 SHA-256: 58f972ddcea83a13a05290ab032739617e6b99ac32a6adbc6243d66efbebfb63
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 'https://ttraff.com/pify?keyword=staff+appraisal+sample+answers'. This URL is presented within the document body, disguised as helpful content, to trick the user into clicking it. The PDF also contains a large number of external links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. 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.com/pify?keyword=staff+appraisal+sample+answers
    • http://files.nursesnowinc.org/uploads/1/3/0/8/130874539/4563997bee1073.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/how_to_sign_a_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/26249767689.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/2572132101.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/pulse_oximeter_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/elia_bombardelli_limiti_forme_indeterminate.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/venifola.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/solutions_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/nibovubonoduwigopis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4344/files/futetuzizemuzibujib.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_off00007910.bin
e4adb7813ef03088be10cbb43eba4cabd16c91756265308f2b54a2068eeb59fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7910 5244 bytes
font_01_sfnt_off00008ade.bin
e9d1d9eb1d6604b3dd5bb371f92671bc5b2ab8b94994edc71f1e6f5041e3a7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADE 10088 bytes

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