Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfde86c44386a3a2…

MALICIOUS

PDF

49.3 KB Created: 2021-06-09 07:47:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b32ad0d47e4afbf2e690e3ee4ff3141 SHA-1: 1710cb21ee9d418e386aec3b497bf756d7e79d9e SHA-256: bfde86c44386a3a2be3f8d75d97b1cea67a8c7ec7e02961ed54b7e35cf9ea456
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA, a common lure to trick users into downloading further malicious content. It contains multiple embedded URLs pointing to sites offering game hacks and cheats, which likely serve as the download source for a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-animal-ears-roblox-hat-game-hack PDF link annotation
    • http://sttlets.education/senayan//repository/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/pubg-uc-no-human-verification_GM1330123889.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005153.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5153 27356 bytes
SHA-256: fb6811af0351d1bdd1e7de6dde341d617c090e613e3dc9d5f0c71444e5bce1a2
font_01_sfnt_off00008ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF3 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D05 18660 bytes
SHA-256: 2be2e8d4eb753bc37c392be5161789e5b5d5b394933d2c61fcf40cd4c1df4f5a

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