Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5db51541cf4ffd6…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 01:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 473aa8dd25086f396e09882c7c35aec8 SHA-1: 118b387c5e3721dcf33486aaa8554bfdcfae8724 SHA-256: f5db51541cf4ffd60fd6fa7bf3d48a72c63f3ccb492a03c3c12b0c6a7ed76cf2
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a primary link pointing to 'https://ttraff.ru/pify?keyword=exemplo+de+texto+dissertativo+argumentativo+pdf', identified as a malicious redirector. Additionally, it hosts a large number of external PDF links, many hosted on cdn.shopify.com, which is characteristic of a PDF link farm used for SEO manipulation and potentially distributing further malicious content. The document body contains obfuscated text and references to wkhtmltopdf, suggesting it was programmatically generated to host these links.

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.ru/pify?keyword=exemplo+de+texto+dissertativo+argumentativo+pdf
    • http://files.foundationfirsthorsemanship.com/uploads/1/3/1/3/131380345/dovexe-lulurux-wipurupogila.pdf
    • http://files.movinghometocyprus.com/uploads/1/3/1/6/131636914/4144882.pdf
    • http://files.shannondrhodes.com/uploads/1/3/0/8/130873907/1944747.pdf
    • http://files.foundationfirsthorsemansh
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavoriduxosijalas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/52478613803.pdf
    • https://cdn.shopify.com/s/files/1/0435/4267/5608/files/68797285135.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/fevavufewomesejisal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/d_d_3._5_planar_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/54013162437.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/genetic_disorders_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/gibibagumer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/papexarerexeturaroz.pdf
    • https://cdn.shopify.com/s/files/1/0445/5071/7604/files/highlighter-_rouge_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0450/6848/4758/files/functional_occlusion_in_restorative_dentistry_and_prosthodontics.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_off00006ce5.bin
98fb118f152595dc3f07447c45d3f11282d899d86bd3d9d50f6fad5db3fc00cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE5 5444 bytes
font_01_sfnt_off00007f66.bin
4d3d7b234f36c2de308108b6c9af7d20fc4e4d14d68c3c45393cb201b617d000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F66 11920 bytes

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