Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ec20f66cbe026a…

MALICIOUS

PDF

44.1 KB Created: 2020-06-05 01:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7bad8f3e0483fc6906bb1603a4ee80b SHA-1: bf23df50fff801425e3e8b9258610fadfb151665 SHA-256: 37ec20f66cbe026a0342fd4a296f272a80b636eea2e2b4e5c163fed8211f85fe
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host further malicious content. The document body, though heavily obfuscated, contains references to URLs that are likely used to redirect users to malicious sites. The primary attack pattern observed is the use of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://l-tic.net/uploads/1/3/1/3/131379029/131379029.html#garrett+at+gold+instruction+manual
    • http://stretchedmama.com/uploads/1/3/0/9/130969504/nataf.pdf
    • http://whipwash.net/uploads/1/3/1/6/131606002/bidonogifu.pdf
    • http://oliviabosek.com/uploads/1/3/1/1/131164318/jeberotozowen-pefumipulud-raxef.pdf
    • http://jewishsculptures.com/uploads/1/3/0/7/130739430/372daa84b5.pdf
    • http://l-tic.net/uploads/1/3/1/3/131379029/terms.html
    • http://l-tic.net/uploads/1/3/1/3/131379029/dmca.html
    • http://l-tic.net/uploads/1/3/1/3/131379029/policy.html
    • https://rizefoxug.files.wordpress.com/2020/06/72438621877.pdf
    • https://kuxogufebaji.files.wordpress.com/2020/06/49488360769.pdf
    • https://wibakozom510253839.files.wordpress.com/2020/06/difuxo.pdf
    • https://dalelifewu.files.wordpress.com/2020/06/65974077944.pdf
    • https://tupawev.files.wordpress.com/2020/06/60463200012.pdf
    • https://puxamalegaga.files.wordpress.com/2020/06/2742543648.pdf
    • https://zexizuzog.files.wordpress.com/2020/06/2017514674.pdf
    • https://pegivemabi.files.wordpress.com/2020/06/37514650821.pdf
    • https://varimos.files.wordpress.com/2020/06/88449235587.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_off00007ec8.bin
dd41bd27b7b4ed919e00313d536701f42e99a3416e39e62be6c929180e584eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 11224 bytes

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