Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca2bcefd32fd4c9…

MALICIOUS

PDF

53.9 KB Created: 2021-06-08 18:25:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f129ede93202c039b0b379c22bf4f787 SHA-1: 82318e5ba4fb122e6d668a6d28fd6d2106d34b20 SHA-256: 0ca2bcefd32fd4c9a2f3488e9648ac974f4ca93cc766b732a585dbbb833f4c45
82 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 to trick the user into clicking a link, which is a common social engineering tactic. The embedded URLs suggest a lure related to free in-game currency or items, such as Robux or Coin Master spins. While no scripts were explicitly extracted, the PDF structure and ML classifier indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 4

  • 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
  • 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.tw/app/431946152/free-robux-promo-codes-2021-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac//repository/earn-robux-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbx-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-windows_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/tiktok-free-comments_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pubg-uc-app-download_GM1330123889.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005096.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5096 37076 bytes
SHA-256: ea444f020fb505eddd49525a22a24102e9b4661a73a169ff1c7121f7a59c12c1
font_01_sfnt_off0000a174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA174 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000ae1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1C 19004 bytes
SHA-256: 2ae4233163b81a205a597c97f5f9bceef85a21038461a0399da8d1b6d9f39b0a

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