Malicious PDF — malware analysis report

Static analysis result for SHA-256 213b931a8759e219…

MALICIOUS

PDF

45.6 KB Created: 2020-08-20 21:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af2fb9731435804768cffc890b994968 SHA-1: 679edb97ddd7dae35500e27974dc7d942a69ccbd SHA-256: 213b931a8759e219ad18b775e7ba90e2e7bd5d62691810159e5f84e7fd759dd0
150 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=brewmaster+bis+guide, which is likely the initial lure. The presence of a large number of external links, many pointing to Shopify domains, suggests a link farm designed to obscure the malicious destination.

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=brewmaster+bis+guide
    • http://files.audio4n6.ca/uploads/1/3/1/8/131856725/f7bd285c82ce3cf.pdf
    • http://files.victoriaedgarr.com/uploads/1/3/0/7/130775434/1978109.pdf
    • http://files.luminaris.link/uploads/1/3/0/8/130813887/pilaxosoborexidikoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/46162112246.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/pdf_converter_to_word_free_download_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/1008/0420/files/instagram_bot_tool.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/tech_mahindra_interview_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/23527854358.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/chemistry_compound.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/moboluwuwadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/gekasuzek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/7964466640.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/ireport_not_loading.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_off000073e7.bin
0d7398cfcca8ea47a06cf00ac814770e406837803977fb1f41a1ee6d11a0e1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E7 5396 bytes
font_01_sfnt_off0000862e.bin
433be03834ea6d523bd2b3209a72d37ecea3abc18952e265ecd7aa596ce080cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862E 10516 bytes

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