PureBasic

Unobfuscate a Spammy Email

Demonstrates the Chilkat Email.UnSpamify method, which unobfuscates an email by undoing common spammer tricks — it removes comments from HTML bodies and unobfuscates hyperlinked URLs. This example cleans an HTML body whose link was broken up by an inserted comment.

Background: Spammers deliberately scramble HTML to slip past filters — inserting empty comments in the middle of words or URLs (example.com), or otherwise obfuscating links — so the message renders normally to a human but confuses naive keyword matching. UnSpamify reverses those tricks, producing a normalized body that is easier to analyze, classify, or scan for the real destination of its links.

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IncludeFile "CkEmail.pb"

Procedure ChilkatExample()

    ;  Demonstrates the UnSpamify method, which unobfuscates an email by undoing common spammer
    ;  tricks: it removes comments from HTML bodies and unobfuscates hyperlinked URLs.

    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkEmail::setCkSubject(email, "UnSpamify example")

    ;  An HTML body with an obfuscating comment inserted into a hyperlink.
    CkEmail::ckSetHtmlBody(email,"<html><body>Visit <a href=" + Chr(34) + "http://exa<!--x-->mple.com" + Chr(34) + ">our site</a>.</body></html>")

    ;  Undo the obfuscation.
    CkEmail::ckUnSpamify(email)

    cleaned.s = CkEmail::ckGetHtmlBody(email)
    Debug cleaned


    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure