Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd79bf3183375cc6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-10 20:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05bf8892cbc47fba2a8cc2d331ba7143 SHA-1: ec973a9d08f862892f6866a50a53202a8083a2f2 SHA-256: bd79bf3183375cc6ff4a5d0aac0c3f12af39900595becd89e0f67ad5b152357e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a benign document. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate the document's primary purpose is to redirect users to malicious infrastructure. The embedded URL https://ttraff.cc/pify?keyword=factorising+algebraic+expressions+pdf is the most critical IOC, as it is the entry point to the attack chain.

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=factorising+algebraic+expressions+pdf
    • http://files.quantumae.net/uploads/1/3/1/6/131637546/6178593.pdf
    • http://files.hannahbeerfas.com/uploads/1/3/1/3/131378993/kimewovibuvew_puvufolulud_kevexegofa.pdf
    • http://files.lahongsnap.com/uploads/1/3/0/8/130814644/sodapefufexifowig.pdf
    • http://files.morpheusandiris.com/uploads/1/3/0/7/130738569/76a393.pdf
    • http://domizi.blockchain-real.at/uploads/1/3/1/3/131380183/6174912.pdf
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/rofewi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/how_to_make_macros_in_roll20.pdf
    • https://cdn.shopify.com/s/files/1/0438/1956/5216/files/42880079152.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/pelikiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/7441688906.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8453/files/60148379050.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/7298669956.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/67567247357.pdf
    • https://cdn.shopify.com/s/files/1/0429/2529/3724/files/true_500_treadmill.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/89766998135.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/48318039889.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_off00006267.bin
6fdfe1b484406f814b70b2e87162114e329c3d74fd8fa2ab9c68f59a4fd811e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6267 5484 bytes
font_01_sfnt_off0000751a.bin
04fbe85e1a69a638bd734b5f4e3b808ff06b9151ae5483777900727c7c3c3d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751A 14580 bytes

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