Malicious PDF — malware analysis report

Static analysis result for SHA-256 178a6d5521f6937a…

MALICIOUS

PDF

46.1 KB Created: 2021-06-10 22:29:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 789cccae0ddd1880a978342151fe5d62 SHA-1: 11dd5e8db0e5b7c32aa80d7b86a4312285a75d7a SHA-256: 178a6d5521f6937a902609510a87f458b46b27096b560aa2fc2e5c0b144d0792
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into downloading a payload from an external URL. The document body and extracted URLs suggest a theme of game cheats and hacks, which is a common pretext for distributing malware. No scripts were extracted, but the presence of embedded URLs and the fake CAPTCHA heuristic strongly indicate a malicious intent to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-funny-hacking-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F1 27576 bytes
SHA-256: eea43297e973f61ec8d39f5e03662feb962e9b0b9fdc8aec98a9f2e809392824
font_01_sfnt_off00008f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F80 19072 bytes
SHA-256: c4f7414aa4b569b5930abe1a15197dffbfcf5c178d75fb94f706806ac46c14a0

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