Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73744b78f1a1b7b…

MALICIOUS

PDF

40.4 KB Created: 2020-08-02 21:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5bb8a4c48f111c4309fb63f21b785f SHA-1: a307cc7d7faf897ecb5f193deda0bd6eecb7887b SHA-256: b73744b78f1a1b7b83146cee7bc3164fdfe4a1690fc77afa2d74b41441422c53
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Case 580k parts' and the URL 'https://ttraff.ru/pify?keyword=case+580k+parts', suggesting a lure to a malicious site. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm strategy to distribute malicious content.

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.ru/pify?keyword=case+580k+parts
    • http://files.crossplainsdental.com/uploads/1/3/1/0/131070113/3542883.pdf
    • http://files.rivertonmiddleschool.com/uploads/1/3/1/4/131438211/4363375.pdf
    • http://files.julieanneason.com/uploads/1/3/0/7/130775265/nivuri.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/fazejaxomesobowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/26775055758.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2422/files/jovubibeduxup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/87405639089.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/talafoxusawixenubo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/paragraph_for_typing_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/nurirebemovorakure.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/fibakowatatunolapofeke.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/bogozeterejet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/30218835055.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/pupamisofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/figefopokatupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/83687843560.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/bopezolupomiwodejawun.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_off00005744.bin
17732834657ae91279c32b7305b1e11ccd4ef72e4cc1a7fc1ada5a412d1c081c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5744 5208 bytes
font_01_sfnt_off00006907.bin
a77847432864c0d5ef001d4a5cb5de4aeb442d97a799030e7c7c75f8dc408364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6907 13356 bytes

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