Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fd9e01fd223648…

MALICIOUS

PDF

33.7 KB Created: 2020-09-04 02:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038d33c721b164f0784ac8c96e69bfdf SHA-1: 738ed0517430019c7a4ddf74383b9d3bfae607c8 SHA-256: a8fd9e01fd223648981521dce7c6eb677abf6e59d0ad0ca613c83b3795277da3
150 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.link/wix?keyword=polynomial+divided+by+monomial+worksheet'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify and static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. The primary intent appears to be redirecting users to malicious infrastructure under the guise of providing a worksheet.

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.link/wix?keyword=polynomial+divided+by+monomial+worksheet
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0437/2509/5062/files/futiniwijuninogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/37933939322.pdf
    • https://static.usrfiles.com/ugd/110ef3_57d03b174ead42beb1bc543e40ce5ac1.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/38142658109.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/ipcc_report_2018_summary.pdf
    • https://static.usrfiles.com/ugd/eda9ba_f349af12b650404bafeff13374f2775b.pdf
    • https://static.usrfiles.com/ugd/3f2390_6ded75f89a7f4db19a9e8fdb25dc846b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0b63bac26bf4b85856eaaa80428c009.pdf
    • https://static.usrfiles.com/ugd/0aab01_029c10cfa9aa4cb28e98f0a0357cbd89.pdf
    • https://static.usrfiles.com/ugd/07625c_ca64e8c9776344418f247a86cf45c7c1.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_off000046e6.bin
0891e4df8b8753128fbc7e57ded3a4a5c9c9ee4ebb63be17cb23f63de070e8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46E6 5524 bytes
font_01_sfnt_off00005995.bin
ba8923e1544b4aacedbf6573963ccc526eff88f20eb3cf48a892bbadb6112d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5995 9652 bytes

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