Malicious PDF — malware analysis report

Static analysis result for SHA-256 288a26bd7a4023cd…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 10:35:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 332377162469f2fd736ecf13c64e41b6 SHA-1: fbbd822548692c2ebde0343622a708c532c0fd66 SHA-256: 288a26bd7a4023cd86242e669886bace151bd29d661605a68bcad349d5b3be83
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains multiple embedded URLs, one of which is directly linked to a fake CAPTCHA heuristic, suggesting the user is intended to click through to a malicious site. The document body itself contains obfuscated text and URLs, further supporting a malicious intent to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.tw/app/431946152/roblox-free-account-biz-game-hack
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-spins_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-minecraft-for-free_GM479516143.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-master_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-for-android_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-bling-bling-card-coin-master_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/hack-tiktok-fans-free_GM835599320.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/robux-hack-me_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coinmaster-rewards_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-minecraft-server-hosting-24-7_GM479516143.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-spins-for-coin-master-app_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-coin-app_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/free-premium-roblox_GM431946152.pdf
    • http://bentoking.co.uk/media/storage/editor/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://bentoking.co.uk/media/storage/editor/files/50-free-tiktok-likes-trial_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000501d.bin
e71829b6bde8cb4d46a9431dd46e1289bbf522eaaba0dddb9dce166cfb672eeb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501D 25900 bytes
font_01_sfnt_off00008b76.bin
6439377ca72109f5b374509c4f08f18c3003e57d0ca10d5374456fa8bc3b446e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B76 18392 bytes

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