Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b8f2609f58b54a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 02:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b761016819841dbd6bd376eff4e74171 SHA-1: 7902de59276600ce654367ea0f1266c73dddd1e4 SHA-256: 33b8f2609f58b54ac1c747acad92dd65708e79dfb38e42c454f7f49df52e2a12
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.cc/wix?keyword=milan+kundera+la+insoportable+leveda, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, also contains this URL and numerous other links to shopify and static.usrfiles.com domains, suggesting a broad attempt at distributing 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.cc/wix?keyword=milan+kundera+la+insoportable+leveda
    • https://cdn.shopify.com/s/files/1/0463/3228/0994/files/silver_alloys.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/vaburupaditumur.pdf
    • https://cdn.shopify.com/s/files/1/0436/8397/1237/files/dazefumoxoru.pdf
    • https://static.usrfiles.com/ugd/253000_ea33843b1911409882818c6a0ab340c0.pdf
    • https://static.usrfiles.com/ugd/47b1e8_53255869faa04fcea4bc95b476fc2651.pdf
    • https://static.usrfiles.com/ugd/ca300b_ebd99a3dfe6a4bc186a6599fcb97ca12.pdf
    • https://static.usrfiles.com/ugd/b8c837_675826b6c0e14a5c887689b8dad0a5f5.pdf
    • https://static.usrfiles.com/ugd/b11f6d_f2d6b161263a4427b8465627204b844b.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_c2b993b831fc44858129a18027decc86.pdf
    • https://static.usrfiles.com/ugd/b8c837_58ab13cd913f46148ffee3d58e94a141.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5574/files/loreg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/badisugejaxufufej.pdf
    • https://cdn.shopify.com/s/files/1/0447/7576/8221/files/architecture_drawing_exercises.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_off00006086.bin
e221123985d5990ca4be38d7f12e2b5445add15afb00c7ba60f8b4c235dd106b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6086 5220 bytes
font_01_sfnt_off00007252.bin
c2e003c1de231d83af153988af2c43c4673561fcfa0400906973d278e4f32a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7252 10392 bytes

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