Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f003161586f0af…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 13:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f06b0c8ef6742ec204ffa7cfa3583cf SHA-1: 2860876c3a2387b590497e62c9bb08073928043e SHA-256: 91f003161586f0afa9b2d1037d7cfca28468f50a5deca5e8fa1c05521eb0f517
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=purdue+owl+apa+personal+communication'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body appears to be corrupted or heavily encoded, but the presence of the redirector URL and the link farm suggest a phishing or malicious redirection 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.ru/wix?keyword=purdue+owl+apa+personal+communication
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/safe_bearing_capacity_of_soil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/nfs_over_ssh.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/8260835638.pdf
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/16922959509.pdf
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/diccionario_biblico_strong_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0459/9460/6751/files/didokofojagorekugitawigij.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9259/files/kakaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7401/8716/files/60963923177.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/57333600147.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/angular_7_ecommerce_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/wufazadogozorafujeta.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/jawovanevu.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a36094868c549edb7d52b3539906ddd.pdf
    • https://static.usrfiles.com/ugd/88a84f_c9322962ae9644739b3212ff77a29f52.pdf
    • https://static.usrfiles.com/ugd/b8c837_9015b1e3454d4fabb526a9633a00aa3b.pdf
    • https://static.usrfiles.com/ugd/9edd50_e1be9242feb9468389ef83761fb61476.pdf
    • https://static.usrfiles.com/ugd/02beb7_683454d6323b4c5581622e9089842979.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_off00006ccc.bin
64e752591bf5ba53f38d584755aa7e7ec743471c8b090e167a60a5dff719aacb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 5312 bytes
font_01_sfnt_off00007ed7.bin
758570a0247f2ed4eb84525e7d5a4d1e89936a3f06284e44fc2bbc8767a0c13d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED7 10364 bytes