Malicious PDF — malware analysis report

Static analysis result for SHA-256 384a331ea5b7844e…

MALICIOUS

PDF

41.2 KB Created: 2021-04-28 18:15:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1bc173beae3f24975061866919d21c18 SHA-1: 77be4d9017a32da8623d3bdae904d21440efb932 SHA-256: 384a331ea5b7844e211840f844cb3954c87ecfae1f00396a070ba4d16a62b8c8
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links and text lures related to 'free Robux' and game hacks, impersonating brands like PayPal. The primary malicious URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-a-human-verification-game-hack, is presented as a call-to-action for a generator, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit user interest in game cheats to redirect them to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9443

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-a-human-verification-game-hack.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-a-human-verification-game-hack PDF link annotation
    • https://www.malesse.com/ckfinder/userfiles/files/robux-hack-no-download-or-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-on-ipad-pro.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/no-virus-hack-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-xbox-one-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-list.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000040ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40CE 25868 bytes
SHA-256: 4ffe43788139658f32a48e1db1cb5474a693552fe4e514922f296ca2cfdd3281
font_01_sfnt_off00007c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7A 19388 bytes
SHA-256: 74b79d0e99834e1a86ffcaa35c6294bef9b076f0c8f4ab8bc168f18b6a66d2c6

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