Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a3de0c5f5abce6…

MALICIOUS

PDF

51.1 KB Created: 2020-08-30 13:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02c867169f0f4f13cc7bc8da8a78d2d1 SHA-1: b8150df295bde39bd32ecb18e2ab239389cc022c SHA-256: b0a3de0c5f5abce6df2f0971d0e154547568a86ec7a79410f22183c3be9f89f4
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=adalet+hukuk+dili+ve+adli+yaz%25C4%25B1%25C5%259Fmalar+ders+notlar%25C4%25B1'. This URL is presented within the document body, disguised as academic course notes, to entice users to click. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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/wix?keyword=adalet+hukuk+dili+ve+adli+yaz%25C4%25B1%25C5%259Fmalar+ders+notlar%25C4%25B1
    • https://static.usrfiles.com/ugd/868401_b60a53b672b140789bc840027f10c4b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_035a758a74d84b788bc3ace722448051.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7a807859dc34f56aad9b7afb7e94efb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/descargar_formato_receta_estandar_sena.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/roxefawomusetit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/sakoxuziwixox.pdf
    • https://static.usrfiles.com/ugd/b7ed05_4b86897daa4348809e9706f6ea02d1eb.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_edb9ba7622f149cdbd6949051ed55fad.pdf
    • https://static.usrfiles.com/ugd/0aab01_ebbbbc629e7d4f6fbb2f932666066667.pdf
    • https://static.usrfiles.com/ugd/50de67_ef5c9e76c8de4d53a878df08aae4dc45.pdf
    • https://cdn.shopify.com/s/files/1/0434/2785/6536/files/acsm_weight_lifting_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0456/5178/7943/files/105817846.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/breaking_dawn_part_2_full_movie.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_off00008663.bin
b58d7a3a53fd7924bdb94d6bdf806b9e9e6019fdae345ff0ffd95c694205e8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8663 5608 bytes
font_01_sfnt_off000098e6.bin
3288bbb52678bb66a5807ed280777581cd739675df975d5a8218361d40a828e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E6 11800 bytes

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