Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a8c73e1157b224…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 12:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7e7cdedc5e504d29aee170f10d3bdaec SHA-1: cf668f74cd8757bda590f2e883f1a941ed525057 SHA-256: 13a8c73e1157b224c846703510663b1eaac27299157a39cb729da5a07b6d8db8
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, a common lure to trick users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/431946152/robux-gift-card-free-game-hack', likely lead to further malicious content or malware downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/robux-gift-card-free-game-hack
    • https://www.jjpremiers.com/files/how-do-we-get-free-robux_GM431946152.pdf
    • https://www.jjpremiers.com/files/coin-master-free-spins-link-no-verification_GM406889139.pdf
    • https://www.jjpremiers.com/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://jjpremiers.com/files/game-hack-coin-master_GM406889139.pdf
    • http://jjpremiers.com/files/minecraft-pe-apk-free-download_GM479516143.pdf
    • http://jjpremiers.com/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://www.jjpremiers.com/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://www.jjpremiers.com/files/get-robux-today_GM431946152.pdf
    • http://jjpremiers.com/files/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdf
    • https://www.jjpremiers.com/files/coin-free-master_GM406889139.pdf
    • https://www.jjpremiers.com/files/minecraft-hacked-client-18_GM479516143.pdf
    • http://jjpremiers.com/files/coin-master-daily-bonus_GM406889139.pdf
    • http://jjpremiers.com/files/coin-master-free-spins-today-new_GM406889139.pdf
    • http://jjpremiers.com/files/coin-master-free-stars_GM406889139.pdf
    • https://www.jjpremiers.com/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • http://jjpremiers.com/files/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://jjpremiers.com/files/coin-master-coins_GM406889139.pdf
    • https://www.jjpremiers.com/files/free-minecraft-com_GM479516143.pdf
    • http://jjpremiers.com/files/how-many-levels-are-in-coin-master_GM406889139.pdf
    • http://jjpremiers.com/files/how-to-hack-coin-master-facebook_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004763.bin
6390fe9d4682af8f7fbe83030a218e3cb4a935e56486d4d2ed92d05ea599dba4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4763 24940 bytes
font_01_sfnt_off00008130.bin
dc19c2dc7c571358abc7904f3409549de68542ff7a2dde77b507fd070c6276df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8130 18640 bytes

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