Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4bb3f71170d607…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 05:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eb38eed5ae8428b69d6da5b7beddb4f SHA-1: 5d4ba616fb4bf7e1286b8b35e477ef9b4589ef09 SHA-256: 3f4bb3f71170d60751a43b2cba3be1612be89a24782f023f4303cd8f6a573bdb
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO abuse. One critical heuristic identified a link to a known malicious redirector at ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to disguise the malicious intent.

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/wb?keyword=year%203%20maths%20subtraction%20worksheets
    • http://files.ashleycarruthers.com/uploads/1/3/2/7/132710621/gopis.pdf
    • http://files.tomjohnsongolf.com/uploads/1/3/2/7/132741110/bc51c15d667bf33.pdf
    • http://files.newjerseywritingalliance.org/uploads/1/3/1/0/131070841/4540fe0f.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/3084605657.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/2920770225.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/jajem.pdf
    • https://cdn.shopify.com/s/files/1/0446/7975/7977/files/graveyard_keeper_hops_seeds.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/lonely_planet_cuba_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/jirow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/rujuramofit.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/graphic_design_skills.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_off00006e07.bin
caeafc8c6cf516f1e6031f39de659b3d508643c63d4e41f1cad6fcca463cf872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E07 5428 bytes
font_01_sfnt_off0000806a.bin
27f627f98177cd4a9a5d23ad3855b8cfaee142806904f687ea8c680fc19b2730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806A 10020 bytes

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