Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81dee5b88f807ee…

MALICIOUS

PDF

46.8 KB Created: 2020-08-13 22:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b787850c7eac1e976b94437a18b3c670 SHA-1: d997ef98773c3414c31e8fd7f1f3725a279ba694 SHA-256: b81dee5b88f807ee3f223b1d209225876984849f03596c73006591c23123976b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains. This indicates a link farm or redirection attack designed to lead users to malicious content.

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=coffy+movie+parents+guide
    • http://kaxuzutez.pawneeil.net/uploads/1/3/1/6/131607240/vijoxufiratoraso.pdf
    • http://files.reading-works.org/uploads/1/3/0/7/130775668/vamorobagix.pdf
    • http://ramiwif.sadkaneaikidoschool.com/uploads/1/3/2/8/132815002/3949018.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/41478992435.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/bevoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7366/6213/files/28910557364.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/18132968081.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3141/files/76986275145.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/mitosis_cell_cycle_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/90954034900.pdf
    • https://cdn.shopify.com/s/files/1/0430/0976/9631/files/guardian_top_100_novels.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/20793898176.pdf
    • https://cdn.shopify.com/s/files/1/0435/3726/8900/files/periodontologia_clinica_carranza_9_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/approximation_algorithms_for_np_hard_problems.pdf
    • https://cdn.shopify.com/s/files/1/0450/4708/7262/files/cracking_the_pm_interview_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/mass_effect_andromeda_annihilation.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_off0000774e.bin
f5aeaa1b1b8e1084e32a2516047736f2d485543e2e3db706612046135bb16ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774E 5396 bytes
font_01_sfnt_off0000899e.bin
9ea22c3d46d3ae0640d5f247c58536b9249c23b53032c16c07ee669daa7f89d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899E 10652 bytes

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