Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff2ec857947973d…

MALICIOUS

PDF

51.5 KB Created: 2020-08-31 16:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a12ad7e1d8f2be701a48e764ab285e89 SHA-1: 013f75ab37e64b273df998f4cad4f5d6863cf61c SHA-256: 4ff2ec857947973df788b1f06855e5d7c96d26115740bc73dcd336aea87882b0
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This indicates the document is designed to lure users to a potentially harmful destination. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of a malicious intent, likely for phishing or malware delivery.

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.cc/pify?keyword=syntactical+expressive+means+and+stylistic+devices+pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/labopalaxiberovubigaxej.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/67529542072.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/relebowekeburonapigut.pdf
    • https://cdn.shopify.com/s/files/1/0429/5419/5097/files/16025691195.pdf
    • https://static.usrfiles.com/ugd/2274a7_2c80e26e6f964ce4aa694b3564d238ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e92215b4e45415382f634a0c6f2f504.pdf
    • https://static.usrfiles.com/ugd/44b221_032b000154a043ada8e8e901f290b8cf.pdf
    • https://static.usrfiles.com/ugd/fbccce_cebce76aaf454dc7a3d142da88cc2bc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_5360837f048243f5b64ed894b6c65273.pdf
    • https://static.usrfiles.com/ugd/b8c837_85c083b6b0854b4e8345a9ec73436407.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/2585194822.pdf
    • https://cdn.shopify.com/s/files/1/0428/1260/4582/files/texas_form_05_167.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/zilawel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e80.bin
937e2f8a344caf937fd19dc6adbb77669f5f2230879206dcece5f82875eb5a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E80 5312 bytes
font_01_sfnt_off00009078.bin
187d98822d836841103de76440e45a35a3c4d36f0fd3572704b93ca04d2e0926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9078 10032 bytes
font_02_sfnt_off0000b2d0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 4324 bytes

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