Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15852970f3093f8…

MALICIOUS

PDF

50.8 KB Created: 2020-08-08 10:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41cf147d2ee4564ac55eea6ddc1c7b35 SHA-1: 353a0279fbc144ec8bacb91220038c722cf51848 SHA-256: a15852970f3093f888b7783c220c4560d841a7f5382adf68f843b42960a2b836
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=ssc+steno+2020+notification+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains references to the redirector URL and a benign-looking PDF filename, suggesting a lure for users to click through to malicious infrastructure.

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=ssc+steno+2020+notification+pdf
    • http://files.chairelectoral.com/uploads/1/3/0/8/130814596/gakusivelegewuk-giperib.pdf
    • http://files.emmaharry.com/uploads/1/3/1/6/131606121/14ea0e08976f.pdf
    • http://files.nishatrades.com/uploads/1/3/2/6/132683181/a7bc3f19e87525.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/zabeburigulopu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/xibinesetos.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6789/files/administrative_law_hector_de_leon.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/anthropometric_data_for_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/puniguvo.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/appsc_polytechnic_lecturers_previous_question_papers_for_mechanical.pdf
    • https://cdn.shopify.com/s/files/1/0432/2836/4968/files/64719682831.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/gekuwesupudetoxuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/zawefa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/67141235723.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_off0000888b.bin
5b872ef1280b674ad3f29d8e1ba9cab1ffd14fe3f5379f77ed72bd2d3e61ea64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 5400 bytes
font_01_sfnt_off00009b00.bin
f05ceadc1242293d786d626beb3f7c000e33d8b29dff19d104f40883077f2b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B00 10312 bytes

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