Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b658dabed9d361…

MALICIOUS

PDF

39.8 KB Created: 2020-08-25 23:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a49de0683d28293623a4752b6c261d79 SHA-1: cec6ec164a0c0ce9845b3e8931d5dbe5502522dd SHA-256: a3b658dabed9d3610c6612ff73bf50b56b20b50fc31ea0cf52a4a76163b7d037
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, with a critical heuristic firing for a PDF link farm. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=gay+bars+in+lexington+ky', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL. The presence of numerous links, including a malicious redirector, suggests an attempt to lure users to malicious sites or to manipulate search engine rankings.

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/pify?keyword=gay+bars+in+lexington+ky
    • http://files.wolsinghamwayfarers.co.uk/uploads/1/3/2/7/132740375/1391454.pdf
    • http://files.adamsstringshack.com/uploads/1/3/2/6/132681928/9d295fccb566f.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/form_e-_595e.pdf
    • https://cdn.shopify.com/s/files/1/0439/2547/1400/files/partnership_business_plan_sample_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0473/9232/files/aula_de_espanhol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/bristol_fire_pump_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/51886581075.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/3639322304.pdf
    • https://cdn.shopify.com/s/files/1/0431/3002/8194/files/83191019188.pdf
    • https://cdn.shopify.com/s/files/1/0448/1787/5110/files/aarti_sangrah_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1112/files/47769544007.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_off00005ca8.bin
c165767e44bead29ba1c40d60bcf26a5afc44e343be6ff19682b425c321c65fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA8 5256 bytes
font_01_sfnt_off00006eb6.bin
74eb75f9be010ce231ce7cae9e21fc2e3f3ce811efce5ca9f6cf853052b1abc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB6 10660 bytes

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