Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14c0cd79831b30a…

MALICIOUS

PDF

56.5 KB Created: 2020-10-28 22:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff4044a20f4ae6255400e3fe93fca854 SHA-1: 9980512872c344cf7ebe6a0e98b8e0ae79843008 SHA-256: f14c0cd79831b30a75dab6a9406bc740797a693f796c7982a7498b4c68173729
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The embedded URL, 'https://cctraff.ru/aws?keyword=north+carolina+school+of+science+and+mathematics+ranking', is the primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains text related to school rankings, suggesting a lure to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cctraff.ru/aws?keyword=north+carolina+school+of+science+and+mathematics+ranking
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5f95162077643.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f8d9825a30a9.pdf
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f8aad1f22837.pdf
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f8fd00dae59c.pdf
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f95124875d61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39e2f1c0-1b44-425e-942c-b1d1a636edd1/66712713449.pdf
    • https://cdn.shopify.com/s/files/1/0492/2864/4508/files/48852312910.pdf
    • https://uploads.strikinglycdn.com/files/f46fcb37-3ab5-4e22-aec5-556e998755fa/71026126013.pdf
    • https://cdn.shopify.com/s/files/1/0266/9484/4587/files/craigslist_austin_texas_cars_and_trucks_for_sale_by_owner.pdf
    • https://uploads.strikinglycdn.com/files/9d9d4ac8-468d-4b82-a34d-85d512ebadf6/poe_crafting_service.pdf
    • https://uploads.strikinglycdn.com/files/399b9310-a458-44d4-8015-7fff08149fdd/zavoralibekuwatokomiv.pdf
    • https://uploads.strikinglycdn.com/files/b8616667-e30f-45c8-a22e-0b053aa35ce2/68678672399.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/25862026143.pdf
    • https://uploads.strikinglycdn.com/files/574eafa3-c7d7-4bed-ae1d-7b349cb7bc84/9300582817.pdf
    • https://uploads.strikinglycdn.com/files/3a08ba04-f488-4cc6-861e-eabc228a681f/60218302485.pdf
    • https://uploads.strikinglycdn.com/files/b41583d6-81a1-4f81-bc33-b73a90aea942/86992959149.pdf
    • https://uploads.strikinglycdn.com/files/2525e1d3-0895-4245-8f47-5bf85fcb5386/geography_of_ancient_greece_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/16e728e3-9320-476b-92b1-abc3aa0a3fb9/21847210343.pdf
    • https://uploads.strikinglycdn.com/files/96a0b3bb-8460-4362-89c1-1f1bb1fcb386/antique_shaving_mug.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ab5f.bin
31a65bb00e6647c9b0ab928e4585655f18d739707882561aee4a238889e7aa63		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAB5F 23236 bytes
font_00_sfnt_off00007402.bin
fe5384acf994fab64bc1469edd8220bc608254e24beccf89c09b37449ca1b0a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 5468 bytes
font_01_sfnt_off00008672.bin
7ebe337f63cbbd1034d9b52d3fca88bac14c2f17247c7465cd6a0d31bd937092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8672 10704 bytes

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