Malicious PDF — malware analysis report

Static analysis result for SHA-256 3357cc4a6f5ca3fe…

MALICIOUS

PDF

44.0 KB Created: 2021-04-25 15:14:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81b002456c63dd018ea6921d8a055247 SHA-1: 9fead39773f0516e5e793c9fe93822eb4592ad8f SHA-256: 3357cc4a6f5ca3fe142b97cb66fc6e71cc450df948152e7889cb1e420a75ee31
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures related to game hacks and free items for Roblox, directing users to external URLs. The primary URL, https://netcdn.xyz/app/431946152/free-roblox-clothes-creator-game-hack, is flagged as a game hack redirector. The document body also contains multiple links to other PDF files hosted on nlcitychurch.org.hk, which are likely part of a malicious distribution chain. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/free-roblox-clothes-creator-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-coloring-pictures-for-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/granny-roblox-free-download.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-catalog-free-pastebin.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/robux-hack-pro-tv.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/robux-hack-generator-download-on-android.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/adopt-me-hack-tool-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-a-shirt-for-free-on-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-website-survey.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-no-offers-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/google-roblox-catalog-free.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000040a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40A5 26700 bytes
SHA-256: 6267f3112c14decf720af7410571f846b9d92e4bea989f0769a3f7e30d1a0b58
font_01_sfnt_off00007d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D14 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000089bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BC 18448 bytes
SHA-256: 670e40a92f01f6e7f1d11d7f655495b8dad158f2aa3513918d647291b0fbc6c1

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