Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7adcd3ba5b063f…

MALICIOUS

PDF

53.8 KB Authoring application: Pdftk
MD5: d9f9983b662bc62c517226b642775880 SHA-1: efe9931fcfd574b715b956c1dd9ceb6037e90c6c SHA-256: 6a7adcd3ba5b063fad67ade26d1b20f99a953be14a0e868c34b8ff17dab406ed
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards a malicious intent to redirect users.

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://xin.tsecur.com/uploads/2020/01/28/mesexoke.pdf
    • http://djsilentj.com/uploads/1/3/0/4/130435602/8586390.pdf
    • http://my-living-benefits.com/uploads/1/3/0/4/130483670/5ac03bf.pdf
    • http://lub.3destate.ru/uploads/2020/01/29/lanalelusugezeruxelu.pdf
    • http://xam.info-okna.ru/uploads/2020/01/28/bimubidalok.pdf
    • http://kirovsktourist.ru:80/uploads/2020/01/27/kurabovaxevo.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/2/130289628/130289628.html#google+spreadsheets+functions
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00008a51.bin
a954f0f4707a7043b63eef75d3c5c66fcd48cda01c81cda12f37a0f4a74e8a31		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8A51 16732 bytes
font_00_sfnt_off000014d8.bin
9419aec4898b7abcd7671a8c5d94b291a17fb065d3cdd9b65803d62a532d3ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8 14240 bytes

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