Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c35c76e4751a4c…

MALICIOUS

PDF

65.1 KB Created: 2020-09-11 23:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0422a64bb32e04caf1b4683834a33348 SHA-1: 47db0af1388b062fed6bade5a30b1d99a21d437c SHA-256: b7c35c76e4751a4c5db49a16fc29380957008647ce89a45835917cf7a9f0cb13
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to malicious infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests the PDF is part of a larger scheme to manipulate search engine results, likely to lure victims to malicious sites. The ML classifier strongly supports the malicious nature of the document.

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.club/wix?keyword=bpm+en+cocina+pdf
    • https://cdn.shopify.com/s/files/1/0433/9446/5948/files/kubapiwaweb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/polugebif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/pdf_converter_to_editable_word_format.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/network_now_a1_starter.pdf
    • https://static.usrfiles.com/ugd/ddb60a_0bcb927c38eb415695a9d32f018f748b.pdf
    • https://static.usrfiles.com/ugd/9dda13_312b33f46f5a44a6b72330bf1c6435d5.pdf
    • https://static.usrfiles.com/ugd/270e53_88b8ea0a941d4e258e8ac657a07ee426.pdf
    • https://cdn.shopify.com/s/files/1/0482/0385/8072/files/edema_cerebral_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/deep_groove_ball_bearing_dimensions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1568204463.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://static.usrfiles.com/ugd/9b2d9b_74a50f74bd87407dbc10014fa42cd74e.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_e8a1fd4a7f3748a9ae18c7b065bac89e.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_off0000c16b.bin
4c744fe64eae4e177b45e217b2ea3ef8f171d6115d1d08392f96cd4ce3c1d6f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC16B 5044 bytes
font_01_sfnt_off0000d28e.bin
907d2a5c823d5ca1bb0878360b5a257785b3d946df98686587980d97c2fda935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 11592 bytes

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