Malicious PDF — malware analysis report

Static analysis result for SHA-256 a879a232ac46adab…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 17:42:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 51f8c040240f4d088ae981a836d2e0ef SHA-1: 0c0cbba13d3908fc70673d0674de8dd7d6ddd098 SHA-256: a879a232ac46adabc2d34c9a242ff3ab80f585bf1b4829ab00a46cb32289a6a2
130 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA and payment redirection lure, aiming to trick the user into clicking a link for free in-game items. The embedded URL, https://netcdn.xyz/app/479516143/minecraft-coins-free-game-hack, likely leads to a malicious download or phishing page. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/minecraft-coins-free-game-hack
    • https://esl.ipb.ac.id/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • https://esl.ipb.ac.id/images/get-free-lives-on-coin-master_GM406889139.pdf
    • https://esl.ipb.ac.id/images/minecraft-free-download-android-apk_GM479516143.pdf
    • https://esl.ipb.ac.id/images/coin-master-hack-link-2021_GM406889139.pdf
    • https://esl.ipb.ac.id/images/roblox-bloxburg-free-money_GM431946152.pdf
    • https://esl.ipb.ac.id/images/coin-master-hack-ios-apk_GM406889139.pdf
    • https://esl.ipb.ac.id/images/how-to-get-free-robux-hack_GM431946152.pdf
    • https://esl.ipb.ac.id/images/roblox-adopt-me-free-pets_GM431946152.pdf
    • https://esl.ipb.ac.id/images/coinmaster-spin-ml-free_GM406889139.pdf
    • https://esl.ipb.ac.id/images/free-robux-obby_GM431946152.pdf
    • https://esl.ipb.ac.id/images/daily-free-spin-coin-master-link_GM406889139.pdf
    • https://esl.ipb.ac.id/images/hack-coin-master-spin_GM406889139.pdf
    • https://esl.ipb.ac.id/images/free-robux-only-1-step_GM431946152.pdf
    • https://esl.ipb.ac.id/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • https://esl.ipb.ac.id/images/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • https://esl.ipb.ac.id/images/rbx-gg-free-robux_GM431946152.pdf
    • https://esl.ipb.ac.id/images/coin-master-online-hack-generator_GM406889139.pdf
    • https://esl.ipb.ac.id/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdf
    • https://esl.ipb.ac.id/images/best-coin-master-hack_GM406889139.pdf
    • https://esl.ipb.ac.id/images/roblox-robux-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bbe.bin
348d56bfb0e56e615002d3bc7fb0733f22339cca57426823495c3a64ebf32bc0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBE 25556 bytes
font_01_sfnt_off0000861c.bin
f11cf7a31a005d7bc14b9508c64b9243aa3fd98d87a18c3c2fdef7c62eb0ce9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861C 17712 bytes

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