Malicious PDF — malware analysis report

Static analysis result for SHA-256 31eb6324dff15bff…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 11:51:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: afa4b5fbaa6a170a2a4e15f75c11dcef SHA-1: a6976ca5faa348f80889e5d8863e706f0206a5c2 SHA-256: 31eb6324dff15bff805e4d75fae1e47361aecf9530fc9f158e9e539301e234bf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample presents a fake CAPTCHA to trick the user into interacting with the document, which is a common social engineering tactic. The embedded URL points to a resource related to game hacks, further supporting a phishing or scamming intent. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to lead the user to an external malicious resource.

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.tw/app/431946152/comment-hack-roblox-unboxing-simulator-game-hack
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/get-free-cards-in-coin-master_GM406889139.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/how-to-hack-robux_GM431946152.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id//repository/free-robux-reddit_GM431946152.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id//repository/roblox-top_GM431946152.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/minecraft-free-minecraft_GM479516143.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/offers-for-robux_GM431946152.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/how-to-hack-coin-master_GM406889139.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id//repository/roblox-army-free-robux_GM431946152.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/robux-without-verification_GM431946152.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/card-hack-in-coin-master_GM406889139.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id//repository/earn-free-robux_GM431946152.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/free-robux-come_GM431946152.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/coin-master-free-spin-link-app_GM406889139.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id//repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdf
    • http://www.perpustakaan.baytalhikmah.sch.id/repository/rbx-free-robux_GM431946152.pdf
    • http://perpustakaan.baytalhikmah.sch.id/repository/how-can-i-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000518a.bin
52fc077f3f42cbc8d360b2b575e82761836ce5eba2b9a8b4bfc3935c503252c9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518A 24556 bytes
font_01_sfnt_off00008a0b.bin
ae31b65b62ba44bb080b518de0c90090809d28a5d2dfb6c62f785005268ad199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0B 19280 bytes

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