Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9678be84b9b53d…

MALICIOUS

PDF

45.1 KB Created: 2020-09-18 00:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e8186b93c18d91d4658439ac2f8a95 SHA-1: 6201c0dcf9bd18b47de97f495308a24b4ca55c35 SHA-256: 3f9678be84b9b53dd0caa33c9c38d6216ac41cf824521960487df0b927614792
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF documents hosted on various platforms. One of these links, https://ttraff.me/wix?keyword=xur+invitation+vex+tangled+shore, is identified as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious sites. The ML classifier also flagged this PDF with high confidence.

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=xur+invitation+vex+tangled+shore
    • https://cdn.shopify.com/s/files/1/0428/1001/5910/files/street_fighter_alpha_2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/73563552805.pdf
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/yahoo_answer_wiki.pdf
    • https://23cc090e-952b-4e52-95d2-4c1b1d3070b2.filesusr.com/ugd/16a96a_673c5ed6d3f24e728005ffbcbc8af7c5.pdf?index=true
    • https://2d0e0991-8f95-4804-bd75-c440d976a0e5.filesusr.com/ugd/a98ecc_98cb4ffd23b6411c880180d2a3d59ad6.pdf?index=true
    • https://a092c391-d1e4-4156-8268-71ebfc1fe6a0.filesusr.com/ugd/a2ebd8_58bf8026a15a4fdcaa790cbfcf65f3d0.pdf?index=true
    • https://8135e4ee-9d4d-4147-bd73-e2783a5c5c9a.filesusr.com/ugd/d93890_9fc88a7a797a4df3a54c56e014354a37.pdf?index=true
    • https://34dd3fd9-d14d-4365-999a-f7d1e388f00f.filesusr.com/ugd/9b7d8a_3baba921d1cf49268a8c7fe6641f5ef2.pdf?index=true
    • https://e6808008-96f7-4880-bf82-dd41f2c6e9f4.filesusr.com/ugd/accd1f_070059aa8e554630a2dbee97d4d7dd9e.pdf?index=true
    • https://8f63b421-af80-40aa-b699-bd49e9f56a03.filesusr.com/ugd/cf79db_1c397fe7d5234e98a500fcb988d9343c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0465/4956/5590/files/free_competency_framework_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/87417410330.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_off000071db.bin
0819cb030f88ef20499503999db05bb75c96de8cf99519d633bd26c7400f89e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 5192 bytes
font_01_sfnt_off00008381.bin
446dd61b3f72e65b39bab1fd5e37780b5f669540ee6c922dbefdc049e49d91be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8381 10844 bytes

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