Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2b5d7bd2a72ba9…

MALICIOUS

PDF

43.7 KB Created: 2021-05-18 06:09:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5ebf793eabccd765c24709651ea923f9 SHA-1: 5324a2906afc3d46cc4e68916dce69b09a4efef7 SHA-256: 4b2b5d7bd2a72ba9ab4f2a176e2e7bf742f2f8ca6006ef3561efe90174d77913
82 Risk Score

Malware Insights

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

The document presents a lure for 'free Robux' and employs a fake CAPTCHA heuristic to trick users into interaction. It contains numerous embedded URLs, with the primary one being https://netcdn.xyz/app/431946152/free-robux-just-enter-username-game-hack, which likely leads to a malicious download or phishing page. The presence of these elements strongly suggests a social engineering attack aimed at compromising the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/free-robux-just-enter-username-game-hack
    • http://reisebild.eu/images/how-to-free-robux_GM431946152.pdf
    • http://reisebild.eu/images/free-roblox-followers_GM431946152.pdf
    • http://reisebild.eu/images/wurst-hacked-client-112-2_GM479516143.pdf
    • http://reisebild.eu/images/free-robux-hack-generator_GM431946152.pdf
    • http://reisebild.eu/images/robux-in_GM431946152.pdf
    • http://reisebild.eu/images/coin-master-free-daily-spins-2021_GM406889139.pdf
    • http://reisebild.eu/images/free-robux-place_GM431946152.pdf
    • http://reisebild.eu/images/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://reisebild.eu/images/free-robux-codes-generator_GM431946152.pdf
    • http://reisebild.eu/images/hack-coin-master-link_GM406889139.pdf
    • http://reisebild.eu/images/coin-master-free-spins-blogspot_GM406889139.pdf
    • http://reisebild.eu/images/simplysarc_GM479516143.pdf
    • http://reisebild.eu/images/how-to-get-coin-master-free-spin-link_GM406889139.pdf
    • http://reisebild.eu/images/master-free-spins-and-coins_GM406889139.pdf
    • http://reisebild.eu/images/cm-free-spins_GM406889139.pdf
    • http://reisebild.eu/images/free-roblox-characters_GM431946152.pdf
    • http://reisebild.eu/images/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdf
    • http://reisebild.eu/images/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdf
    • http://reisebild.eu/images/100-free-spins-coin-master_GM406889139.pdf
    • http://reisebild.eu/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a60.bin
e2c54b1c0e202335f7ac5a3f86dac11fbca1a5252a9cb21e41dba34d557cfd94		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A60 25780 bytes
font_01_sfnt_off00008656.bin
ad194f5984d8cbd7c817d1b512f86f024f40bf30beebdf7d12c6ff62fc849400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8656 18960 bytes

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