Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb18165dad4ca300…

MALICIOUS

PDF

45.6 KB Created: 2020-04-27 07:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 83d3990b358bcfe5d5457598515dd781 SHA-1: 763bb40a536ccac8a930d58495747d793d62a5af SHA-256: cb18165dad4ca3002b25b5bf0baa2ff2c951916d453bdf0a3038fdaab96c095d
62 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains text related to 'hyperbole worksheets middle school', suggesting a lure. The primary intent appears to be directing users to potentially malicious external websites hosted on domains like puckcancer.com and insearchofmaud.com.

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://puckcancer.com/uploads/1/3/0/5/130540700/130540700.html#hyperbole+worksheets+middle+school
    • http://insearchofmaud.com/uploads/1/3/0/6/130640190/rikuz-jejigeja-viruzafirokom.pdf
    • http://royaltramp.shop/uploads/1/3/1/3/131398113/7397709.pdf
    • http://yojoyero.com/uploads/1/3/0/6/130621969/1943533.pdf
    • http://tatumsdessert.com/uploads/1/3/0/8/130813796/lidobulapilu_rovofi_xulav.pdf
    • http://mtzionbcclaremore.org/uploads/1/3/0/2/130289581/lemipawawazojo_bazitivifovo.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089d0.bin
b125a9f2e4c7c7486fed41f3e36e3815b844b67c77d65084b1b2bca71138f866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D0 8176 bytes

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