Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97ea90eac597cdc…

MALICIOUS

PDF

114.7 KB Created: 2020-06-05 00:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3daa5dee729be25c16e2b17f4e70457 SHA-1: e9c1e8e5defba0c81864fe442746150f819a35ec SHA-256: a97ea90eac597cdc66616074a4e76e24189ad9d542e739894fe6e50e19af2ce3
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous external links, a technique often used to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting a link farm for SEO manipulation or malware distribution. The document body, though heavily obfuscated, contains text related to 'Operating system concepts 9th edition solution manual' and the wkhtmltopdf application, which could be used as a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hopeatthecenter.net/uploads/1/3/0/5/130589077/130589077.html#operating+system+concepts+9th+edition+solution+manual
    • http://mta-sts.mx.catamounthillassociation.org/uploads/1/3/0/6/130605280/7434e4b.pdf
    • http://sauerlandhypotheek.nl/uploads/1/3/0/7/130775660/wusejijiw.pdf
    • http://kimcampbellrn.com/uploads/1/3/0/5/130590273/21c6faa.pdf
    • http://hopeatthecenter.net/uploads/1/3/0/5/130589077/terms.html
    • http://hopeatthecenter.net/uploads/1/3/0/5/130589077/dmca.html
    • http://hopeatthecenter.net/uploads/1/3/0/5/130589077/policy.html
    • https://gaxokebika.files.wordpress.com/2020/06/53022230681.pdf
    • https://kebokijukow.files.wordpress.com/2020/06/betod.pdf
    • https://bomovekuj340683747.files.wordpress.com/2020/06/20080882542.pdf
    • https://jadibaxose259795111.files.wordpress.com/2020/06/karawurup.pdf
    • https://tokisize.files.wordpress.com/2020/06/rujasogulepen.pdf
    • https://zabapamedoj.files.wordpress.com/2020/06/fokezapopopivig.pdf
    • https://rolinozopuj.files.wordpress.com/2020/06/depuzigoxosadawoniz.pdf
    • https://podilizaxopu.files.wordpress.com/2020/06/68459698624.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_off000194e9.bin
e6843fba17a93d5cbd98d24b2187ef005cc6beab4406f5863e1fde8978278880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194E9 12124 bytes

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