Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aa3b7d9c518ef9…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 11:04:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3847b077a703e3358dac2c11b064bff3 SHA-1: 5e840087bdb086b0caed68f5c21b0bfcf86244f0 SHA-256: 85aa3b7d9c518ef9583572f6859fe599a9d7a0a811affc9dac9a7d5150be8133
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action lure, strongly suggesting a social engineering attempt to trick the user into clicking a link. The embedded URL leads to a page related to 'free Robux', a common lure for gaming-related scams. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/is-there-any-way-to-get-free-robux-game-hack
    • https://cogp.greentrade.org.tw/image/data/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdf
    • https://cogp.greentrade.org.tw/image/data/files/hack-coins-in-coin-master_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-apk-33-download_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-apps-that-work_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/get-free-robux_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-11-01-2021_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/mcmaster-club-coin-master-hack_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/free-coin-master-spins-no-human-verification_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/actual-free-robux_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/free-roblox-accounts-generator_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-attack-hack_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-extra-spins_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/cheating-hacks-for-coin-master_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-link-today-twitter_GM406889139.pdf
    • https://cogp.greentrade.org.tw/image/data/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-login-free_GM479516143.pdf
    • https://cogp.greentrade.org.tw/image/data/files/how-do-you-get-roebucks-for-free_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-mobile_GM431946152.pdf
    • https://cogp.greentrade.org.tw/image/data/files/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004acd.bin
6ba3e19dbf399dbeb95924131eb6d4da2e28cfb5a040caf1899c1fc5ab9ce25a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACD 24980 bytes
font_01_sfnt_off000083fb.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FB 2940 bytes
font_02_sfnt_off00008e0a.bin
d4b621edf5ac5f073c5a65dd804db4f1f2ad13c123c1b5ace541ce5f5c284f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 18892 bytes

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