Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4caf4e1ac77cd6c…

MALICIOUS

PDF

36.5 KB Created: 2021-06-25 16:45:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 42163157fcda487228c7a42027faa4b9 SHA-1: d06de12e78e7ac1527451bfc18270a3bf6b181d5 SHA-256: a4caf4e1ac77cd6c4d16292e43375251a20dbc66e573b95515db42c083ec1679
102 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt, a common tactic to trick users into downloading further malware. It also contains an embedded URI pointing to 'http://netcdn.co/app/431946152/rxgate-cf-free-robux-redeem-code-game-hack', which likely serves as the download location for a secondary payload. The document body and extracted URLs suggest a lure related to obtaining free virtual currency or game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.co/app/431946152/rxgate-cf-free-robux-redeem-code-game-hack
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/free-coins_GM406889139.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/freespinandcoin-blogspot-coin-master_GM406889139.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/how-do-you-get-free-roblox_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/password-free-roblox-accounts_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/minecraft-for-ipad-free_GM479516143.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/roblox-insta-arrest-hack-jailbreak-pastebin_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/free-robux-codes-not-used_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/coin-master-cheats-and-hacks_GM406889139.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/robuxlove-net-free-robux_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-apk_GM406889139.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/one-piece-nightfall-hack-roblox_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/free-roblox-cads_GM431946152.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/coin-master-fun-hack-online_GM406889139.pdf
    • https://elearning1.man1mempawah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000356c.bin
73da25283b231ce328275f2ce2d3d8858fb23a94aec199ba679057da94776233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x356C 22988 bytes
font_01_sfnt_off0000691a.bin
b75395453cc827d489d59db7d47ae45bb8eeca3a75006627c1766a86b399e374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691A 19252 bytes

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