Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f437125439dfc53…

MALICIOUS

PDF

42.6 KB Created: 2020-08-13 18:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b1c4dad56b614af86e648aa9b144c33 SHA-1: d417aa9112788d6c019fb8a7744aa6c7567a163a SHA-256: 9f437125439dfc535e06e15f1d0fcba0cc8844c6aa3fe62bb6f2abdc4f1c5cd2
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://ttraff.cc/wb?keyword=graphing%20linear%20equations%20using%20intercepts%20worksheet', is flagged as a malicious redirector. This suggests the document's purpose is to lure users through search engines and then redirect them to potentially harmful content or phishing sites.

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.cc/wb?keyword=graphing%20linear%20equations%20using%20intercepts%20worksheet
    • http://gudomu.shopvarietyislife.com/uploads/1/3/1/4/131453540/3c5442a9262c60.pdf
    • http://files.bargeamerican.com/uploads/1/3/1/6/131606291/wusulegemarajuvajif.pdf
    • http://files.edeio.org/uploads/1/3/2/7/132740296/mefopusupeligi.pdf
    • http://kunuko.colegioinglesprimaria.com/uploads/1/3/0/8/130814328/6e10db7c7d07.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/15837109983.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/27262017372.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/biomassa_de_banana_verde_receitas.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/job_application_resume_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muzaloxebomasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/46904513353.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/how_to_darken.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/wimowewipovuvonubejemud.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/41957303840.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/65071905258.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92835403356.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/jotawa.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_off00006662.bin
64b3671528c75ffb9a05a8fc63c4a6dd1f8f6d0f1cb6b8054ed3824263ac3975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6662 5508 bytes
font_01_sfnt_off0000792f.bin
8ccbcdf265d2bdab466f36728a5514bfc22db469a206eb3346079da4410fb2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 10480 bytes

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