Malicious PDF — malware analysis report

Static analysis result for SHA-256 a299c66cbe7b6ba7…

MALICIOUS

PDF

40.6 KB Created: 2020-04-30 19:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b8d4d8a4bb2a362246f4561a4d48d9d1 SHA-1: 02294fe9134f8ef397be003a8eb9190379c9d0a7 SHA-256: a299c66cbe7b6ba75564c4327a31a9f0223a0f72b9e3e5aa7837e45454f6bc1b
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm or a redirection scheme designed to obscure the ultimate destination. The presence of the string 'New bangla natok mp4' in the document body suggests a lure to attract user clicks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://onkoyoga.com/uploads/1/3/0/5/130539338/130539338.html#new+bangla+natok++mp4
    • http://1st-realty.com/uploads/1/3/0/7/130739625/8526530.pdf
    • http://bilgisayim.com/uploads/1/3/0/3/130379474/gapaximizosoga-kasesuwe-nivovurotapaf.pdf
    • http://crackmyselfup.com/uploads/1/3/0/4/130435771/81c2f.pdf
    • http://yandex-afisha24.ru/uploads/1/3/1/3/131398094/4059248.pdf
    • http://buildingat400u.com/uploads/1/3/0/8/130874585/kasavufimeriret.pdf
    • http://alternativehealthadvocates.org/uploads/1/3/0/9/130969032/9645672.pdf
    • http://wirefas.com/uploads/1/3/1/3/131380651/d481631.pdf
    • http://ginaepueyrredon.com/uploads/1/3/0/6/130604791/646e4717301.pdf
    • http://comercializadoralm.com/uploads/1/3/0/4/130490461/ritefozamuvudu_busasomofexuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f28.bin
82dd76e1f643f6f872a6c1741954f06df7733a726405bd36e470a51e04b8eb3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F28 7804 bytes
font_01_sfnt_off00006da3.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA3 1388 bytes
font_02_sfnt_off00007509.bin
971ab4d905c2bb66573a78a14dbdf053121dd1315d9c3c0e1ea59c730d40ca7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 11024 bytes

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