Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08a88f9f4b71438…

MALICIOUS

PDF

38.6 KB Created: 2020-08-23 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b72e8acd36738a2f544e8df9a1f5ee36 SHA-1: c0deb1c36c9c500928b45c9b0f8d11aaabd450a7 SHA-256: f08a88f9f4b714382f254b921bcbf8b97887d16892583f18df55885f3878dcc4
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link pointing to ttraff.ru, which is designed to lure users to further malicious content. The document body, though heavily obfuscated, contains the same malicious URL and numerous other URLs hosted on Shopify, likely as part of a link farm to improve search engine ranking for the malicious content. The ML classifier strongly supports the malicious verdict.

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=characteristics+of+computer+pdf+file
    • http://files.sustainabilityconference.us/uploads/1/3/1/6/131607075/xibanom.pdf
    • http://files.newmontcenter.net/uploads/1/3/2/7/132712050/fa3e9fb95be7023.pdf
    • https://cdn.shopify.com/s/files/1/0430/8877/3269/files/nodedabivulatekezinurene.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/the_creature_from_jekyll_island_griffin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/35359029063.pdf
    • https://cdn.shopify.com/s/files/1/0432/7751/6955/files/circular_saw_guide_canadian_tire.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/98710053080.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/se_binary_not_responding_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0447/0145/0396/files/99830043858.pdf
    • https://cdn.shopify.com/s/files/1/0428/0880/3495/files/brain_trauma_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/rilep.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/62700089345.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_off00005989.bin
86b90e5fd44db13d1022ddb835490ed1d6dd5d57f0a89094ec8a437306667d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5989 5300 bytes
font_01_sfnt_off00006b6a.bin
07124d0d979f9be53303dd9309a98c0332cb9a6f0fcba156293a4a48cc9c07a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6A 10072 bytes

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