Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef63a92b37881fa3…

MALICIOUS

PDF

48.6 KB Created: 2021-05-14 09:00:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 204a1c8d9b6c0b1e6454462cec395f38 SHA-1: 30d8278729e00bf12c49919233d426c15fcdbb5e SHA-256: ef63a92b37881fa3f53c5af14e2bd6e3c2320c0bc16036d712091527abe9b0cc
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with a malicious link, likely to download a second-stage payload. The embedded URL 'https://netcdn.xyz/app/431946152/robux-today-game-hack' and numerous other URLs found within the document body suggest a phishing or scam attempt related to in-game currency or hacks. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/robux-today-game-hack
    • http://fobh.net/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://fobh.net/userfiles/files/coin-master-online-hack-2021_GM406889139.pdf
    • http://fobh.net/userfiles/files/get-robux-for-free-2021_GM431946152.pdf
    • http://fobh.net/userfiles/files/coin-master-free-spin-today_GM406889139.pdf
    • http://fobh.net/userfiles/files/rbl-gg-free-robux_GM431946152.pdf
    • http://fobh.net/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://fobh.net/userfiles/files/free-magical-chest-coin-master_GM406889139.pdf
    • http://fobh.net/userfiles/files/coin-master-heaven-links_GM406889139.pdf
    • http://fobh.net/userfiles/files/coin-master-free-spins-link-ios_GM406889139.pdf
    • http://fobh.net/userfiles/files/roblox-free-robux-hack_GM431946152.pdf
    • http://fobh.net/userfiles/files/get-robux-today_GM431946152.pdf
    • http://fobh.net/userfiles/files/coin-master-twitter_GM406889139.pdf
    • http://fobh.net/userfiles/files/optifine-mcpe_GM479516143.pdf
    • http://fobh.net/userfiles/files/coin-master-tips_GM406889139.pdf
    • http://fobh.net/userfiles/files/free-robux-games-on-roblox_GM431946152.pdf
    • http://fobh.net/userfiles/files/coin-and-spin_GM406889139.pdf
    • http://fobh.net/userfiles/files/coin-master-hack-apk_GM406889139.pdf
    • http://fobh.net/userfiles/files/coin-master-hack-software-download_GM406889139.pdf
    • http://fobh.net/userfiles/files/get-me-robux-for-free_GM431946152.pdf
    • http://fobh.net/userfiles/files/free-robux-safe_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000453f.bin
aa238091f7d1bbb9757fe832b45977dad8532c2de9aa7e81b727d445cb18e827		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x453F 39056 bytes
font_01_sfnt_off00009ba9.bin
959daec5ee9bc3c71d76c0b44e5e7b2fade628e041cf04f050b5917282f814df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA9 18432 bytes

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