Malicious PDF — malware analysis report

Static analysis result for SHA-256 de699f5d44819b0e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 14:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5cadb0916915cc9184ce1c69eb7c4d1 SHA-1: 522c1679586dcdd68358ffc1f753777e2597b70c SHA-256: de699f5d44819b0e9f89381765e33855e7b7b8cfa0a0ae1f51d3b055bae82b19
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to other PDF files, a technique often used for SEO manipulation or to host malicious content. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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=headrush+celestion+ir
    • http://files.energyoftheempires.com/uploads/1/3/1/4/131454383/dekatosofawo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/toxoplasma_diagnosis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/third_person_shooter_games_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/37317388947.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/4906716757.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/lyapunov_stability_theorem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/cinematic_video_editor_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/9698/1147/files/17387495125.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/godomagowazoluzoxidedid.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/basics_of_cooking_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000578d.bin
39b8fbfed7df489ecf3ea38866f1abf87df3b090ddef6d2061a6ff6aa073f481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x578D 4872 bytes
font_01_sfnt_off00006801.bin
72947654f58393b6b92ec3c51653cbffabf1d692d19d85a709b225cc48f9cb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6801 10620 bytes
font_02_sfnt_off00008c05.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C05 4324 bytes

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