Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5f66145d5772a6…

MALICIOUS

PDF

46.0 KB Created: 2021-06-07 19:58:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5fb1e9bb4ca0250e203e0a25649fb60b SHA-1: 3f117a1d8a7d05cd7bd99c761f3b3c1bb9d74d05 SHA-256: 8a5f66145d5772a6e13c19798e5e5c99e99375ac11c8f8515b2275ec6b5c1484
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking malicious links. The embedded URLs point to domains hosting further malicious PDFs, likely serving as a downloader for a second-stage payload. The document body and extracted URLs suggest a theme of game cheats and hacks, a common social engineering tactic.

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/g-eazy-freid-rice-roblox-id-game-hack
    • http://immo360grad.com/images/avatar-roblox-game_GM431946152.pdf
    • http://immo360grad.com/images/minecraft-cheats-pc-2021_GM479516143.pdf
    • http://immo360grad.com/images/download-minecraft-java-edition-free_GM479516143.pdf
    • http://immo360grad.com/images/roblox-pokemon-games-free_GM431946152.pdf
    • http://immo360grad.com/images/how-to-make-a-group-on-roblox-for-free_GM431946152.pdf
    • http://immo360grad.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://immo360grad.com/images/rbx-place-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://immo360grad.com/images/free-spin-link-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/free-spin-link_GM406889139.pdf
    • http://immo360grad.com/images/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://immo360grad.com/images/free-spins-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/coin-master-daily-free-link_GM406889139.pdf
    • http://immo360grad.com/images/funny-roblox-outfits-and-free-outfits_GM431946152.pdf
    • http://immo360grad.com/images/80-free-spins-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/free-robux-com-roblox_GM431946152.pdf
    • http://immo360grad.com/images/coin-master-hacker-club_GM406889139.pdf
    • http://immo360grad.com/images/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://immo360grad.com/images/how-to-get-free-followers-on-tiktok_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050cb.bin
49cd26d583a924438fa2079db863dc900f946c0ddd796d59031598124c7f57d5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CB 27744 bytes
font_01_sfnt_off00009006.bin
d044fe35266784cce9e7b7b1d3e0b314bb89f95102e8eb7ef09b0a1abf5761f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9006 18732 bytes

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