Malicious PDF — malware analysis report

Static analysis result for SHA-256 f673fd7930d07841…

MALICIOUS

PDF

33.4 KB Created: 2020-09-24 14:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3c4f8455335cfeb3bf98cd2bd7ab2f7 SHA-1: 4eed6778240b924157ec7b7cb8e1c4dd5fd64444 SHA-256: f673fd7930d07841c6ac9c6ff11a5715370db2bbb06ee053ea29ce833c54c4d9
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to external content. One of the primary URLs, 'https://ttraff.cc/wix?keyword=dy+teacher+friendly+chemistry+writing+ionic+formulas+lab+answers', is flagged as a malicious redirector. The document's structure and the presence of multiple links on disposable hosting suggest an attempt to lure users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=dy+teacher+friendly+chemistry+writing+ionic+formulas+lab+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://693e3547-983b-4c21-b10c-2111a02c24f3.filesusr.com/ugd/6f53d7_10b24c4706514f70bae22186911cef6f.pdf?index=trueIn PDF document text
    • https://5d5ebe6e-7b63-4bd7-828e-8101c8d00d9b.filesusr.com/ugd/c1c462_4b33f179787d43ca881d17aec0370446.pdf?index=trueIn PDF document text
    • https://3c0fc191-5509-432f-ade5-6b83e11b9135.filesusr.com/ugd/a86d68_469ee2ad3fcf4269ba253ee556b399f4.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/basant_maheshwari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/einstein_riddle_answer.pdfIn PDF document text
    • https://02082f53-3ad5-4b75-9ffa-bbb944cad47b.filesusr.com/ugd/aa14a9_04141b18ed7f49509186cd5fd9c0bb2f.pdf?index=trueIn PDF document text
    • https://91f34ffc-1532-4537-bffa-4add16f0926a.filesusr.com/ugd/45e30f_53e446354a524aadb33b660867bece75.pdf?index=trueIn PDF document text
    • https://d3b9a061-0293-4deb-837c-ea9d388ea7de.filesusr.com/ugd/733c1f_41687c597f2a4171a752e0e76382481e.pdf?index=trueIn PDF document text
    • https://c57cdd14-4c53-41a1-9e34-8ee5c7ff68f4.filesusr.com/ugd/2b25b5_d50d2c5641f146b682afe8da7f698e7a.pdf?index=trueIn PDF document text
    • https://bcc393de-931c-4fbb-9ba0-5ce1a01b7528.filesusr.com/ugd/73cb9e_333ac072320e4bbda90c3c18a3b141d4.pdf?index=trueIn PDF document text
    • https://0e6cc53f-7017-458d-9a04-994b0ad1a5f1.filesusr.com/ugd/9d869b_013cefed8fb54fdb89ea283fb265da2d.pdf?index=trueIn PDF document text
    • https://a45d3aaf-e6b8-4ace-864d-8745f1d1f297.filesusr.com/ugd/3c9ac1_a86d25418f5140f8ad2321dc8fadb265.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5032 5768 bytes
SHA-256: 78de60e45176d7eedeab52fea32d6983a90d39c9ec18f66cc6dc1dd67f104431
font_01_sfnt_off000063d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 10372 bytes
SHA-256: a4518aa605fb69b9f407fea342df5a2b0c0b06a5cb39002a7e46f5ed411f71b5

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