Malicious PDF — malware analysis report

Static analysis result for SHA-256 634fa643b369bb20…

MALICIOUS

PDF

40.6 KB Created: 2021-05-19 15:06:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 296fd6b183b706ca8c112650c07f06ff SHA-1: 5ebb01fea2dfae0ca87d571721a1cd3d8201f088 SHA-256: 634fa643b369bb2065dffa771f4718a34430d521e35eb9b35fa938b8f46c615c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a malicious link. The ML classifier also strongly indicated maliciousness. The document body and embedded URLs suggest a theme of 'free game hacks' or cheats, which is a common lure for malware distribution. No scripts were extracted, but the presence of external URIs indicates a potential download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/835599320/why-is-tiktok-free-game-hack PDF link annotation
    • http://bit-sky.com/images/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/easy-how-to-get-free-robux_GM431946152.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_003_off0000471f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x471F 23796 bytes
SHA-256: 487f6a585b9e52ec7bb1461dbb9a78cbd3160aa11c46981b143205afa05567da
font_01_sfnt_off00007d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D41 18000 bytes
SHA-256: 8735992b8c35d6b954b5a82466038e0a9430fa03b6016d224b16905e5ed45eb5

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