Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76fd8490aa5f233…

MALICIOUS

PDF

109.0 KB Created: 2020-08-04 09:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9963e67611ec0e0a83f47c998f14cd3e SHA-1: b6c26e6c8aac41ee9b81f9f51aaa22023917a296 SHA-256: a76fd8490aa5f2339e52e4aa611b75d57fc9e8ba2e2e1e567e206fb8d3f2c71e
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.ru/pify?keyword=liutprand+of+cremona+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the target URL, suggesting a lure to a malicious site.

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.ru/pify?keyword=liutprand+of+cremona+pdf
    • http://files.sarahbovy.com/uploads/1/3/0/7/130775676/nujen-zoxeke.pdf
    • http://files.jennifercosta.net/uploads/1/3/0/7/130776735/5140869.pdf
    • http://sefipu.thelaughingsole.org.uk/uploads/1/3/1/4/131406717/xejaduvewuruvew.pdf
    • http://files.jacqueleneambrose.com/uploads/1/3/1/4/131408017/7770229.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/mexabulipudufexiwoluvib.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/99950930575.pdf
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/tijebomawar.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/4_digit_addition_with_regrouping_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/sefitefizej.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/52743372666.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/pokemon_rom_for_nds4ios.pdf
    • https://cdn.shopify.com/s/files/1/0429/3640/2079/files/zowenuxopezatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2432/files/59053176293.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_off00017122.bin
752f9b84b76b25be60697d6a49efd713e30c43bd8fabc0fbd9331b8e065c7019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17122 5032 bytes
font_01_sfnt_off00018233.bin
5a60ed05dd6bf36d954a2bc5c46efd65d20b1134a4382337edd2bf61bd69bf6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18233 10896 bytes

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