Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd34b2bcf8728b5…

MALICIOUS

PDF

38.6 KB Created: 2020-08-22 10:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1ca4594acfe4709e25cec7dc1a35380 SHA-1: e73076404474ed8ecd00af0860dd80d8f50b41fd SHA-256: 3bd34b2bcf8728b5265e5caf5ae8857b1937b40bde8761d74e87c74fbf5e8d8b
150 Risk Score

Malware Insights

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

The PDF contains a high density of embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, contains strings related to calendar templates and Excel, suggesting a lure. The presence of numerous Shopify-hosted PDF links, while many are benign, contributes to a link farm strategy. The ML classifier strongly indicates malicious intent.

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.ru/pify?keyword=calendar+template++excel
    • http://files.kevinbennettjr.net/uploads/1/3/0/9/130969183/7363469.pdf
    • http://danukob.bearclawepic.com/uploads/1/3/0/8/130873894/kokiwari-xavugewu-mawekuderesiv-fojof.pdf
    • http://jagexamid.wer4jesus.com/uploads/1/3/2/6/132681670/nemopasil-vitesafuvoxen-fikidikefowezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/57717008456.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/keratoconus_diagnosis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/wevupipatijekugo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/37533967094.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/lisimalobutawerajiva.pdf
    • https://cdn.shopify.com/s/files/1/0447/3107/2666/files/aprendiz_de_brujo_ii.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/76331323823.pdf
    • https://cdn.shopify.com/s/files/1/0428/7211/1260/files/ultimate_spines_fire_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/92753217328.pdf
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/simemibimefig.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_off00005ad2.bin
e43f1395dbb808680e0375730c2723a2c94ebd07c555bbd02778056c96bce60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD2 5012 bytes
font_01_sfnt_off00006bc7.bin
c1e97b5b4a1d34592ab6ee064d8033f95143a003cb434e1bcd8ae70ab86e031f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC7 9896 bytes

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