Malicious PDF — malware analysis report

Static analysis result for SHA-256 f639a7ceeb7a5ad3…

MALICIOUS

PDF

58.7 KB Created: 2020-09-17 08:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3736837345165ee711f9007bfc46c9b3 SHA-1: db95f77dd52970ab61e85524b8a1e1a980c0e1e9 SHA-256: f639a7ceeb7a5ad38ba37ed6bd7e7cd8a7d17ef38a0e465ac07bf0457b36e036
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.me/wix?keyword=ragnarok+renewal+priest+leveling+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a game guide, suggesting a social engineering lure. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent, likely to drive traffic to malicious infrastructure.

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://ttraff.me/wix?keyword=ragnarok+renewal+priest+leveling+guide
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/loxonizoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/gabavorebuz.pdf
    • https://723f7b05-4690-41af-9f2c-305c966e8e53.filesusr.com/ugd/e50c99_a387c04fbd4941158676a518a50c7ba6.pdf?index=true
    • https://cdd6aa31-158e-446b-9125-991912cf48bf.filesusr.com/ugd/b58d21_9c2f9981edb545b48eeeff798ad5b2e6.pdf?index=true
    • https://daafe15a-6ff1-478d-8aae-3017d8c86e88.filesusr.com/ugd/e50c99_af90e9a36d8e4126ac5044102303ab36.pdf?index=true
    • https://97d82cea-afc2-46c4-a3dc-97c733035f73.filesusr.com/ugd/b444d4_00488a18e3cc4658bdb645b1134e933e.pdf?index=true
    • https://9564af7c-169d-4894-abc5-4ae8c5fe1116.filesusr.com/ugd/594ae5_c8b57f8f5a7a4a18ab58cdb14aa06be9.pdf?index=true
    • https://c4610934-08d7-4c46-a9e7-60f1f428b2ef.filesusr.com/ugd/717a42_dfddc827318b429aa1d73cbfc7e8456a.pdf?index=true
    • https://23d0ae00-770e-4433-ae24-6e3cd15343fb.filesusr.com/ugd/4bdc6d_edbe27b7f8954f558c28e20131c9911b.pdf?index=true
    • https://f671a246-159d-45ce-9a3e-1e84883a3610.filesusr.com/ugd/a98ecc_9cf64625f4f846df88173ffec25efcc7.pdf?index=true
    • https://97cb4120-3d38-4ced-a108-be7f6baec9cd.filesusr.com/ugd/2f3ac6_5f9140f16e9844c6ad8c9ed085a2fd03.pdf?index=true
    • https://6aae4b0b-daf3-4432-8fdc-6f07425a4a39.filesusr.com/ugd/2e79a6_b6a24563921e488bb47ca3246abf554b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/veresavarozivopobutupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/zobivazejidulexavoral.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1596/files/bootstrap_4_template_for_login_page.pdf
    • https://cdn.shopify.com/s/files/1/0484/4752/0933/files/terraria_plantera_expert_guide.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_off0000a696.bin
513c3d4915c6bac27263737bb8969c9d00161d3ef0b97194340cfe2749487a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA696 5352 bytes
font_01_sfnt_off0000b8fa.bin
efe98054ec0a82d866fdc08d1b4598f54a41d3bfe1fdcc0b43f48c36f51e22bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FA 10740 bytes

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