Malicious PDF — malware analysis report

Static analysis result for SHA-256 390f086c2c6b1ba1…

MALICIOUS

PDF

47.6 KB Created: 2021-05-20 01:09:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c4e92bc2f05fa1b3f2fc0bb1fdef080a SHA-1: aac35244513c74ed9cc70ed5631c58a719382a69 SHA-256: 390f086c2c6b1ba1628b2202193d1fa3b9cf9a82c395ccd209ceb43b9bf4a5f3
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.xyz/app/431946152/get-free-robux-without-doing-anything-game-hack, likely leads to a malicious download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 https://netcdn.xyz/app/431946152/get-free-robux-without-doing-anything-game-hack
    • http://elektrofahrspass.de/images/coin-master-spin-hack_GM406889139.pdf
    • http://elektrofahrspass.de/images/roblox-skin-free_GM431946152.pdf
    • http://elektrofahrspass.de/images/claimrbx-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-on-facebook_GM406889139.pdf
    • http://elektrofahrspass.de/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://elektrofahrspass.de/images/roblox-free-hats_GM431946152.pdf
    • http://elektrofahrspass.de/images/offers-for-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-hack-no-root_GM406889139.pdf
    • http://elektrofahrspass.de/images/coin-master-free-soins_GM406889139.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://elektrofahrspass.de/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-do-you-get-roblox-for-free_GM431946152.pdf
    • http://elektrofahrspass.de/images/pubg-uc-ykleme-hile_GM1330123889.pdf
    • http://elektrofahrspass.de/images/free-robux-hacks-no-verification_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-unlimited-spin-link_GM406889139.pdf
    • http://elektrofahrspass.de/images/earn-robux-today_GM431946152.pdf
    • http://elektrofahrspass.de/images/roebucks-on-roblox_GM431946152.pdf
    • http://elektrofahrspass.de/images/minecraft-free-no-virus_GM479516143.pdf
    • http://elektrofahrspass.de/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000496f.bin
772b9a29a66085df74ac74eb4fe4811a98c28f82824eaaf02a23e9b5e79b3b27		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496F 26908 bytes
font_01_sfnt_off000087bd.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BD 5696 bytes
font_02_sfnt_off000094ce.bin
a9e3aa10522a438dd9eef37bb3e7f322f16e38379d063b4a50e22a05dda2bc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CE 19240 bytes

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