Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99a66b1b9587083…

MALICIOUS

PDF

48.5 KB Created: 2020-07-31 01:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0de8c8d2fddc45a4fde9f5ce6d7a6cd SHA-1: ccd27b7339523596ecf507b24972ab258ef4bfc4 SHA-256: f99a66b1b9587083956c1b99ecf300d0f848c780505aa1b9ae4ba8d22eb43b13
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=best+bank+reasoning+book+pdf'. The document body, though heavily obfuscated, appears to be a lure related to a 'best bank reasoning book pdf'. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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.ru/pify?keyword=best+bank+reasoning+book+pdf
    • http://files.lifestylehealth12.com/uploads/1/3/1/4/131437516/lovakemegixebotefa.pdf
    • http://files.daveslattum.com/uploads/1/3/1/3/131379540/gufiraruduwida_xabimokemanezo_tuganimut.pdf
    • http://files.geisterwolfeshepherds.com/uploads/1/3/0/9/130969300/4206746.pdf
    • http://files.afterhoursbandus.com/uploads/1/3/0/8/130874533/gilepinulom-girelumu-gonojabe-xoxatudapu.pdf
    • http://files.tarpanpartners.com/uploads/1/3/2/6/132682607/17c005f77.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/14952320157.pdf
    • https://cdn.shopify.com/s/files/1/0435/8252/1503/files/jaluduvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/joxibubow.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/71754864208.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8266/files/12944066254.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/72475072841.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/xajotegus.pdf
    • https://cdn.shopify.com/s/files/1/0440/8662/4406/files/gikif.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/vepixozuvitoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/dugufakimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/47955315984.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_off00007f8f.bin
783fcb0861b2a1f71acc2c2e60ad6ffe6fc8ebcf30d38215fc31dd4422af1c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8F 5216 bytes
font_01_sfnt_off00009156.bin
61ea742b7d2c701342b33014963e5b3e1196f049a3269dbde225ac1afa7baee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9156 10920 bytes

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