Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05a5b5d58b8c557…

MALICIOUS

PDF

37.9 KB Created: 2020-08-28 01:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a99b3f642431b231912093a0e5260cc SHA-1: e5146e2b5500534bbc0e41b5bb005fc34cbabad8 SHA-256: f05a5b5d58b8c5578f3fa550bc397a4248fb0fffa5e573a92d803b05a04cb15f
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on Shopify, likely as a link farm to improve SEO for malicious content. One of these links, presented as "driver vehicle inspection books", redirects through ttraff.ru, a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a delivery mechanism for further malicious content or phishing attempts.

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=driver+vehicle+inspection+books
    • http://files.hsc3knives.com/uploads/1/3/0/9/130969243/a00465f049b.pdf
    • https://cdn.shopify.com/s/files/1/0449/7453/8920/files/information_technology_auditing_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/3462/1590/files/zabixini.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/fodameragere.pdf
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/vebugiwimi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/15836579125.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/feroroloxuxipanawewoboz.pdf
    • https://cdn.shopify.com/s/files/1/0454/0166/9800/files/38610984120.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/37221870389.pdf
    • https://cdn.shopify.com/s/files/1/0447/8844/9437/files/learn_basic_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0431/9032/1313/files/malotunozimevugodowifig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5300/files/apple_app_store_logo_guidelines.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_off00004a54.bin
457b3202c50ef75d49d1894264c1270c67dc9a8f677d2d9fb7c6b25c01562b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A54 5072 bytes
font_01_sfnt_off00005b99.bin
58845ee4ffb75369829ed9e0e36bdc827dde68429192a85ba72ba98bf9d74394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B99 15120 bytes

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