Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b200dbe8420cd3…

MALICIOUS

PDF

42.8 KB Created: 2020-09-06 02:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d1fd90acbedc3fafa5af1fc89b361c7 SHA-1: cf1ef227a18bce7e9d18c547af2d2580d8d35ab0 SHA-256: 52b200dbe8420cd3e973d56ff9bee98f7020fe14924fd1bb932a70bdc5ddbe67
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the text 'Business letter format with letterhead' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this. No scripts were extracted, and the family is unknown due to the lack of specific indicators.

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.me/wix?keyword=business+letter+format+with+letterhead
    • https://static.usrfiles.com/ugd/b8c837_849a8febcf734a0292e4c09faf8f00b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f757f43f1b9348f0a2e983e75a6fd8ff.pdf
    • https://static.usrfiles.com/ugd/599026_1b76842783604fb6b19553a0637786d4.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/reported_speech_questions_and_answers_exercises.pdf
    • https://static.usrfiles.com/ugd/e6e573_2f2e89807462444880b946831ab279ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_17c8f6c4e40b4f0fa3f29c9311347c6c.pdf
    • https://static.usrfiles.com/ugd/f4de5e_84cfc13fedc64263984750140c00a702.pdf
    • https://static.usrfiles.com/ugd/93c935_0548d3f92c4a4b428169a9d8d23062d1.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/bsi_iso_9001_audit_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/guitar_riffs_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/76207517745.pdf
    • https://cdn.shopify.com/s/files/1/0448/1862/8765/files/holding_deposit_agreement_template.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_off000069e9.bin
24ab9e3b82e4a5ec873958cf4db418715d33509c030159896af1f262a8522428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E9 5288 bytes
font_01_sfnt_off00007bc7.bin
563b1eac57e0ef81cc5939779ec86119e5ce3c7fe7197d7c8c3425b34e6c20ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC7 10152 bytes

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