Malicious PDF — malware analysis report

Static analysis result for SHA-256 b919d5f3bff51bac…

MALICIOUS

PDF

58.6 KB Created: 2020-08-30 08:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beb73a185fd26bee1b32540c36e33ceb SHA-1: 8d6dcab06209eca59caa5fa0871d88dc9a1f2b24 SHA-256: b919d5f3bff51bac46c54559e72b77868eeaf2d6b6efece27baae7e55493c5cd
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'Examining the fossil record' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm further supports the malicious intent.

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/wix?keyword=examining+the+fossil+record
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/41058766698.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/9744175027.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/14836103889.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/dijirekodok.pdf
    • https://cdn.shopify.com/s/files/1/0464/2507/9960/files/70574456686.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/principles_of_auditing_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/allowable_stress_design.pdf
    • https://static.usrfiles.com/ugd/9b5f63_fc1a4577f12f456db2cd54963b712bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_24929345fbb940dbb2dee78f07c4ccf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3242fbb5d0d34c3583bbbcd71ecc4925.pdf
    • https://static.usrfiles.com/ugd/538d67_4a43c9b932864229929b32602c312e0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_799fc3ec7588419b9818c07b63ee78e6.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_off0000a906.bin
1462baf24dd2075c1131f8122f60c8500b6ddf83bfc22eae55381608b0c4277e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA906 5460 bytes
font_01_sfnt_off0000bb6c.bin
d75ab0482e17be46c7daee425d15a7aeba6ba72760c06260cb4688925a31ea95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 10120 bytes

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