Malicious PDF — malware analysis report

Static analysis result for SHA-256 426548e6fa7ffb9e…

MALICIOUS

PDF

60.2 KB Created: 2020-07-24 13:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b709fd431387883553e7f0efaaec9f04 SHA-1: 8cab43416802bd1dd9a39eda338ff60ff9536abb SHA-256: 426548e6fa7ffb9e7fdb608e1e63df3a6e12f1771a6802f550fbf72bb60a056d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'cdn.shopify.com/s/files/1/0431/5804/4827/files/dokelu.pdf'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and mentions 'Agroforestry book pdf free', indicating a lure for users seeking free content. The combination of these factors strongly suggests a phishing or malware distribution attempt.

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=agroforestry+book+pdf+free
    • http://files.wmchsprojectgraduation.com/uploads/1/3/1/4/131409794/migiluvolufojulixok.pdf
    • http://files.ataraxiaphotography.com/uploads/1/3/1/4/131455883/jazozixure.pdf
    • http://files.joreed.net/uploads/1/3/1/0/131070508/zifuri.pdf
    • http://files.livingoutofthisworld.com/uploads/1/3/1/4/131453188/mosexolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/dokelu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/74003026390.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/susemukojowibawa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/lolajamagil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/44280612200.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/fefazovatuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/rikelepafozujasosuwojerax.pdf
    • https://cdn.shopify.com/s/files/1/0437/3453/2245/files/zaxosezu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/fitakidobizamiwirumi.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_off0000a7de.bin
f4331309eefdc1a56b81416fc833c27f7b317b3d8fe5dd0170d494dc641a86a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DE 4896 bytes
font_01_sfnt_off0000b8a4.bin
a372ee22bc658736acfe3c7ebac56aadad49f21fc3a4f2afdaf12f00eabaf77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 13844 bytes

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