Malicious PDF — malware analysis report

Static analysis result for SHA-256 92868c2b6b4a4860…

MALICIOUS

PDF

37.3 KB Created: 2020-09-01 23:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b89c70d0534a47dceef1fe15a07078be SHA-1: fde66fd313aa5fcb0537a0f6a5c5d15138505528 SHA-256: 92868c2b6b4a4860f14b0679c7cd9bb31b2e0f65152f59951499d392e0cfff73
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.cc/wix?keyword=closed+cell+foam+sheets+insulation'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same malicious URL and text related to insulation, suggesting a lure to entice clicks.

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=closed+cell+foam+sheets+insulation
    • https://static.usrfiles.com/ugd/ce14f3_dca7e0843ef04498a2032b0a142a9490.pdf
    • https://static.usrfiles.com/ugd/665c20_8a721f18a81a432e9af56632df4ef8eb.pdf
    • https://static.usrfiles.com/ugd/4117a9_f431f46e7a7d4d16a89ecd40623798fc.pdf
    • https://static.usrfiles.com/ugd/dc98cc_2671cc7fbc2247a7a4628ef382de10ce.pdf
    • https://cdn.shopify.com/s/files/1/0445/8535/3380/files/belt_and_road_initiative_indonesia.pdf
    • https://static.usrfiles.com/ugd/4479ed_15c5bc8cc60c4f2e86ba933fc38f1bb0.pdf
    • https://static.usrfiles.com/ugd/739437_34f47714b027466a8997481ff47e269f.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/big_ideas_math_geometry_oklahoma_teacher_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/dixigubilemowunej.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/thrilling_adventure_hour.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_off00005407.bin
3180ceb2cb3f70326e94773a2f083cf6fd975789e578d197ee2920309df0a011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5407 5068 bytes
font_01_sfnt_off00006521.bin
914e22af951d1d72893769c11915c232345c85c09ef0f263e9bbdce9a8bfe8d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 10520 bytes

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