Malicious PDF — malware analysis report

Static analysis result for SHA-256 499d9ec837694b40…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 18:35:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cacdbe81cea18ab4cd263af79b9a898d SHA-1: 85e0d651110a33d929830c6425b4cd7eae96cbe7 SHA-256: 499d9ec837694b40e5479c6cefb5b7254ff676b7fc9dac1f4734c97a6d89759f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous embedded URLs and a prominent link in the body text, all directing users to sites promising game hacks and cheats. The ML classifier also flagged this PDF as malicious. The presence of a 'password-protected archive' lure suggests the document may be intended to bypass security controls by encrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/how-to-hack-accoutns-on-roblox-game-hack PDF link annotation
    • http://tc-kulmbach.de/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-dont-sign-up-for-free_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/youtube-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/games-for-robux_GM431946152.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_004_off00004e8d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E8D 27676 bytes
SHA-256: e643da03b7b51eadd5c4c4fca8a6d4f5e0ee906f34329e3b91f49e4d5d7f92cc
font_01_sfnt_off00008d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D91 18588 bytes
SHA-256: d6a22c13f06416feffc125aaf7c23e5de020968674a3934d7691bdfb7755ce6f

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