Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67f07d37e77a655…

MALICIOUS

PDF

46.6 KB Created: 2021-05-13 15:02:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 46fb27cb38f14612bb65769012140863 SHA-1: 936ce5e05d33bfcad5fddd96811b4bfec9139d4e SHA-256: a67f07d37e77a6559d77881e2cbae55dc0e230bb9cd0b7d3d3ad605655ef6b84
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or human verification prompt, a common lure for tricking users into downloading malicious files. It contains multiple embedded URLs, including one pointing to a suspicious domain that likely serves as a download source for a second-stage payload. The presence of these elements strongly suggests a phishing or social engineering attack aimed at delivering malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/free-robux-human-verification-game-hack
    • http://optiquedelavaunage.com/images/_GM479516143.pdf
    • http://optiquedelavaunage.com/images/roblox-script-hack_GM431946152.pdf
    • http://optiquedelavaunage.com/images/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://optiquedelavaunage.com/images/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://optiquedelavaunage.com/images/roblox-fun-robux_GM431946152.pdf
    • http://optiquedelavaunage.com/images/win-free-robux_GM431946152.pdf
    • http://optiquedelavaunage.com/images/free-robux-for-free_GM431946152.pdf
    • http://optiquedelavaunage.com/images/minecraft-gun-games-free_GM479516143.pdf
    • http://optiquedelavaunage.com/images/coin-master-new-cards-hack_GM406889139.pdf
    • http://optiquedelavaunage.com/images/coin-master-hacks-free-spins_GM406889139.pdf
    • http://optiquedelavaunage.com/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://optiquedelavaunage.com/images/coin-master-hack-2021-apk_GM406889139.pdf
    • http://optiquedelavaunage.com/images/best-free-robux-sites_GM431946152.pdf
    • http://optiquedelavaunage.com/images/i-robux_GM431946152.pdf
    • http://optiquedelavaunage.com/images/claim-free-robux-button_GM431946152.pdf
    • http://optiquedelavaunage.com/images/best-way-to-get-free-robux_GM431946152.pdf
    • http://optiquedelavaunage.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://optiquedelavaunage.com/images/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://optiquedelavaunage.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://optiquedelavaunage.com/images/actual-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ab9.bin
1c29d39387101f4832f7a97f2c9e74878e251fd68759f76c7007ff82e0d07bdc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB9 26472 bytes
font_01_sfnt_off00008846.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8846 2832 bytes
font_02_sfnt_off000091f7.bin
3ed55990981222bb3dfa17f7dde8eecdc80202874b70715493d2aac032643dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F7 18860 bytes

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