Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c57f40dfd954574…

MALICIOUS

PDF

48.2 KB Created: 2021-05-14 08:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2ca4b7f72de59f3b01e521c064fb4009 SHA-1: f7dcd2a943955c8203efdc2e1415fa4bd35a3db4 SHA-256: 5c57f40dfd954574396697ed2e8490eeb11668fc266ae0994ab14f02c43eadfd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier and contains a fake CAPTCHA lure, indicating an attempt to trick the user into performing an action. The document embeds external URIs, including one pointing to 'free-robux-no-verification-no-download-2021-game-hack', suggesting a social engineering tactic to drive downloads. While no scripts were directly extracted, the PDF structure and embedded links imply a potential for JavaScript execution or exploitation to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/431946152/free-robux-no-verification-no-download-2021-game-hack
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/113-hacked-client_GM479516143.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/how-long-is-the-minecraft-free-trial_GM479516143.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/coin-master-gift-hack_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/lazyblocks-com-free-robux_GM431946152.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/25-free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/robux-no-human-verification-2021_GM431946152.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/100-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/get-free-roblox_GM431946152.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/earn-free-robux-on-roblox_GM431946152.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/roblox-catalog-free_GM431946152.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/coin-master-games-download-free_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/coin-master-collect-today-free-spin_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdf
    • https://elearning.mtsn1kotadumai.sch.id/__statics/gudangsoal/files/minecraft-java-code-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c50.bin
3245ef37a3538a6a56f04a9ccdc69c8d6e338bbe10170b718593df0ce739ecda		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C50 28412 bytes
font_01_sfnt_off00008c28.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C28 2880 bytes
font_02_sfnt_off00009612.bin
6d060c19cfdcabcdc6bddd80792e5ccefe5b0efd90c0cd3f16f1565492dd4e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9612 19584 bytes

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