Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7bfdc8ab816f7c…

MALICIOUS

PDF

45.5 KB Created: 2021-05-13 07:10:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f0cae65df15430c844b00d341a9d89f0 SHA-1: babd289337653713d4050283b2fdb992b9d5dd47 SHA-256: 3e7bfdc8ab816f7c6a2214da9c3e696d80fc14c1a226b5cadf463966e7463d92
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA and a "secret recovery" lure, aiming to trick the user into interacting with malicious content. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack, likely leads to a payload or further phishing content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack
    • http://ff-klaffenbach.de/images/how-to-earn-free-spins-coin-master_GM406889139.pdf
    • http://ff-klaffenbach.de/images/mcpe-hacks_GM479516143.pdf
    • http://ff-klaffenbach.de/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://ff-klaffenbach.de/images/android-coin-master-hack-2021_GM406889139.pdf
    • http://ff-klaffenbach.de/images/free-robux-real_GM431946152.pdf
    • http://ff-klaffenbach.de/images/freespins-coin-master_GM406889139.pdf
    • http://ff-klaffenbach.de/images/daily-coin-master-free-spins_GM406889139.pdf
    • http://ff-klaffenbach.de/images/free-robux-app-real_GM431946152.pdf
    • http://ff-klaffenbach.de/images/free-robux-gift-card_GM431946152.pdf
    • http://ff-klaffenbach.de/images/free-games-coin-master_GM406889139.pdf
    • http://ff-klaffenbach.de/images/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://ff-klaffenbach.de/images/coin-master-blogspot_GM406889139.pdf
    • http://ff-klaffenbach.de/images/coin-master-daily-spin-link_GM406889139.pdf
    • http://ff-klaffenbach.de/images/coin-master-hack-online-pc_GM406889139.pdf
    • http://ff-klaffenbach.de/images/free-robux-codes_GM431946152.pdf
    • http://ff-klaffenbach.de/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdf
    • http://ff-klaffenbach.de/images/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://ff-klaffenbach.de/images/how-do-i-get-free-robux_GM431946152.pdf
    • http://ff-klaffenbach.de/images/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdf
    • http://ff-klaffenbach.de/images/coin-master-offline-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b95.bin
d07b0a8f6fe034bac210227ee931d661bfcd50926737bbd206e51054bdfd60b0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B95 25248 bytes
font_01_sfnt_off00008483.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8483 2840 bytes
font_02_sfnt_off00008e35.bin
4144dbe1534d0325d37e4c6129895ddb34a2bc26123e242025982d4ceef1bd2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E35 18644 bytes

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