Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3c248b699e71e0…

MALICIOUS

PDF

46.8 KB Created: 2021-06-13 23:35:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8f82be3b5fbecf3e47752fb5948aaf9b SHA-1: 132adb37c3b53f376e56695ca3a19ca2400b8e77 SHA-256: ac3c248b699e71e0e1973fe14c2900d8fd7f58ac8ef265953c0a1bd3ff7f510e
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt, likely to trick the user into downloading a malicious payload from the embedded URL. The document body and embedded URLs suggest a lure related to "free Robux" or game hacks. No scripts were extracted, but the presence of external URIs and the fake CAPTCHA heuristic strongly indicate a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 http://netcdn.co/app/431946152/free-robux-no-survury-game-hack
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/minecraft-switch-free_GM479516143.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/minecraft-apk-android-free_GM479516143.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/roblox-password-hacker_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/free-gifts-coin-master_GM406889139.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/free-robux-games_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-java-free_GM479516143.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-cheat_GM406889139.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/how-do-you-change-your-name-on-roblox-for-free_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/coinmaster-rewards_GM406889139.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/whats-robux_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/earn-robux-now_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/rbl-gg-free-robux_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/roblox-tix-generator_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/coin-master-claim-spins_GM406889139.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-only_GM406889139.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/give-free-robux_GM431946152.pdf
    • https://elearning.mtsn2palembang.sch.id/__statics/gudangsoal/files/coin-master-hacks-reddit_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc7.bin
606d3834f989c93060ed938d3f506032c14a672c0a7263c59fd20d5c3fd14985		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC7 25424 bytes
font_01_sfnt_off0000871f.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871F 5696 bytes
font_02_sfnt_off00009431.bin
d3a10f634c5ecc3d7353c949fdf4d39280fe41fff4e373acd575ae0d5bea3c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9431 18308 bytes

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