Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef37df5bbfc0465…

MALICIOUS

PDF

38.9 KB Created: 2020-06-17 07:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9df80fea1eba3c1c67769db2f7794088 SHA-1: 27d6c75e51e920c93e906f5f967621680ed0ff97 SHA-256: aef37df5bbfc04650d9c3db38564cbd4dcc2fb40a476a6f28fdd22447d9b4e78
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to SEO-optimized PDF files hosted on various domains. This pattern is indicative of a link farm or traffic redirection scheme. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://powerwindowpartscom.com/uploads/1/3/1/6/131606124/131606124.html#convertir+pdf+en+jpg+online
    • http://roofingcharlestonsc.com/uploads/1/3/0/7/130739783/eb3f115.pdf
    • http://grupoforrajeroxalos.net/uploads/1/3/0/4/130436033/19463ee1.pdf
    • http://koinoniamissions-org.davidmichaeldesigns.com/uploads/1/3/0/3/130324440/kudanutolufus-kupoxefal-zudaj-familinine.pdf
    • http://afterflowacademy.com/uploads/1/3/0/3/130323889/zidujafavuru.pdf
    • http://globalnationalfunding.com/uploads/1/3/0/9/130969411/2440354.pdf
    • http://texassomms.com/uploads/1/3/1/8/131858791/pikefak-mifixura.pdf
    • http://jenniemoorepta.com/uploads/1/3/0/4/130483062/sovofobezezi.pdf
    • http://geosfotografia.com/uploads/1/3/0/6/130620776/guridodebad.pdf
    • http://hostmaster.kidwellybowls.com/uploads/1/3/0/6/130604312/9234830.pdf
    • http://enjoythecbd.net/uploads/1/3/0/2/130291908/diwurobodebuwim-pemusopofat-mamodozofo-niginebaseraso.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_off00005a16.bin
f31c6c5500f993e97455a17f133322655952a81470c0037498f56fb76a86379a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A16 4768 bytes
font_01_sfnt_off00006a69.bin
0201347da615d3b7765998279d90283e43532a9dc53c34b1316dab141fcf73bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 11464 bytes

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