Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99c1cd09dfd6d96…

MALICIOUS

PDF

53.1 KB Created: 2020-08-30 21:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eb025b8916c3e61b019f2f5b156b8d1 SHA-1: 20e6feaa96d833ff59c008f9387f0a5110e784a7 SHA-256: f99c1cd09dfd6d960ba24d4146a1024f307e027aec38076618eb91ea57d86988
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=cch+azcapotzalco+plan+de+estudios'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/b8c837_e28f30ce82144481a06ca84e8cbf376e.pdf' being a prominent example. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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/wix?keyword=cch+azcapotzalco+plan+de+estudios
    • https://static.usrfiles.com/ugd/b8c837_e28f30ce82144481a06ca84e8cbf376e.pdf
    • https://static.usrfiles.com/ugd/b8c837_88218eff24bf439d88857ad7bd5bbd51.pdf
    • https://static.usrfiles.com/ugd/e5a943_0eb4f7dcc558473fbb1a17ec856a35c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/sedebizosenewevilulonamuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7123/files/43526829313.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/puzifafuwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/filtre_quartz_mac.pdf
    • https://static.usrfiles.com/ugd/b8c837_c63e815e773a4c7ea93a1fa3253f668e.pdf
    • https://static.usrfiles.com/ugd/930050_efd2ed212eda4e5a9cd7682c0e0f7e14.pdf
    • https://static.usrfiles.com/ugd/b8c837_52637f0ed32840d0a19be67597a8bf2c.pdf
    • https://static.usrfiles.com/ugd/87b9a8_f4e9afbe84a14d1eb24d727d36b9c802.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d01c966a0c143d886debc6ec7c5fe9d.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_4af8110f9df84ad8bd9b9d92b7cfe0b2.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_off00008e90.bin
070f0dfb54b3ffcc1c5b45a8a7e031ce9d2bab2d1c6909fa0707be87e72ca521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E90 5020 bytes
font_01_sfnt_off00009f97.bin
43382a5b44b8d8ac002a50f3848a4ffb86eab43759f31b57aef6edc93bbaa314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F97 11708 bytes

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