Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26beff8789ea8c8…

MALICIOUS

PDF

805 B
MD5: 3890cce9f6b5fc1b513973fd6ad76764 SHA-1: a4051ca8ec05f246f5aba9fb60840e75e4193308 SHA-256: d26beff8789ea8c8be63af44cb9dea8ed1726dc4565c54be1301d3356d4ba853
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1059.005 Visual Basic

The PDF contains a launch action that executes cmd.exe, which in turn echoes a VBScript payload to a file named m.vbs. This VBScript is designed to download and execute a second-stage payload from the URL http://qoppsite.info/new_aaa/tmp/m.vbs. The script uses string concatenation to obfuscate the creation of 'Scripting.FileSystemObject' and 'WScript.Shell' objects.

Heuristics 4

  • Launch action high PDF_LAUNCH
    PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • /Launch action target: cmd high PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM"'.
  • 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://qoppsite.info/new_aaa/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000006f.bin
ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5
pdf-embedded-script PDF decompressed stream script payload at offset 0x6F 63 bytes