Malicious PDF — malware analysis report

Static analysis result for SHA-256 562988cf19390a75…

MALICIOUS

PDF

43.5 KB Created: 2021-05-13 17:00:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5c84dee21e54352941ef33ecb175201a SHA-1: 7f8a5ec9cbb39ed2618324d1cb108d6e9d049e8f SHA-256: 562988cf19390a75b5859ec0bd40c9df0ad97c9db8aaf2eaedea9537544d2e12
102 Risk Score

Malware Insights

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

The document presents a lure for 'free Robux' and displays a fake CAPTCHA, aiming to trick the user into interacting with a malicious link. The presence of a fake CAPTCHA heuristic strongly suggests a social engineering tactic to bypass user caution. The primary IOC is the external URI pointing to a suspicious domain, likely serving as the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-link-game-hack
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/cm-free-spins-and-coins_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • https://elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-on-flip-master_GM406889139.pdf
    • https://elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-rare-cards-hack_GM406889139.pdf
    • https://elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/minecraft-pe-hack-client-ios_GM479516143.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdf
    • https://elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/free-coin-master-spins-for-today_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-free-spin-facebook-link_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-android_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-free-attack_GM406889139.pdf
    • https://elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/coin-master-hack-pc-cheat-engine_GM406889139.pdf
    • http://www.elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://elearning.mtsnkanigoro.sch.id/__statics/gudangsoal/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b40.bin
da2d4096333873ac64711e5e02c5d9c58bf22465194bcd8f263fba5e19fb6ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B40 25992 bytes
font_01_sfnt_off000087a7.bin
a4aae99c46e0a0f586669c3aecb8c0d6e5f23962dc49b2f1654f133382ac5317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A7 18304 bytes

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