Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83bc8c776fc5c5f…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 14:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82f2a952706801c57f3eb29ccd7d4a6 SHA-1: ea0540a205a6d66227eb7f7e59344ed46a4a3b78 SHA-256: a83bc8c776fc5c5f2c90c93907aceebc6c4cc990d5d696deccbd4e3dbb0b6fec
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files hosted on various domains. This suggests a coordinated effort to redirect users to malicious content, likely for phishing or malware distribution.

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.com/pify?keyword=bhojpuri+movie+2019++hdvd9
    • http://jufegelog.core-nmsu.org/uploads/1/3/0/9/130969352/xusudojasadat-fumorud-kuworimak.pdf
    • http://files.aimeekalmus.com/uploads/1/3/0/9/130969160/tuturomezodafupoda.pdf
    • http://files.benedictbrooks.com/uploads/1/3/1/3/131379530/1727028.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/pevudusalelogumusaxug.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/bemafusako.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/dasob.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/peguvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/31671583440.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/taller_de_coaching_ontologico.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/bible_niv_version_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5114/5626/files/avg_vpn_on_android_box.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/75040784659.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/3459158554.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_off00004cb2.bin
c96da905ff1042388add675f45bd8e8018c1bdebaba7c54e06f539c68e3d1822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB2 5444 bytes
font_01_sfnt_off00005f30.bin
8ffba59c0b9ba4c79263917d6cb52cd293208bd17056a3ed0dec7859e7ff22c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 13496 bytes
font_02_sfnt_off00008944.bin
f92a1e9c7d8bfa7393b995e3f446abd374724e2bf380f62466da40776dc86539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 4724 bytes

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