Malicious PDF — malware analysis report

Static analysis result for SHA-256 847a1f833b5e9e05…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 05:12:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 718618da8c2ca728ea5c5ce9e541feb9 SHA-1: 7b0643dbacdff6bea817e21884a2519489267d33 SHA-256: 847a1f833b5e9e05215018892d30e0137a7db511666c0b9c1f957e9d68d414c9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URLs, one of which is directly linked to a potential payload download. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-roblox-toy-codes-june-2021-game-hack
    • https://pustaka.widyakartika.ac.id/repository/free-robux-live_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/games-like-coin-master_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/worst-roblox-avatars_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/roblox-accounts-for-sale-free_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • https://pustaka.widyakartika.ac.id/repository/tiktok-likes-free_GM835599320.pdf
    • https://pustaka.widyakartika.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-in-arsenal_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/roblox-games-com-free_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/free-spins-for-coin-master_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/android-coin-master-hack_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/free-games-coin-master_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/can-pokemon-go-free-promo-codes_GM1094591345.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/rewardex-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d9.bin
da953f9e4f3f0b62f0bc58efdf2fdf3a60a4ab318613c8eab65202610f14b508		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D9 26488 bytes
font_01_sfnt_off00008afd.bin
28029c6f3da3a239c968b41329b69511015f5a3ee01d34ab428a7845e101c20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFD 19012 bytes

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