Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d440817ad157f1…

MALICIOUS

PDF

46.4 KB Created: 2021-06-10 21:44:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a8e9091324e81b0affe67d2ab3185a2 SHA-1: d6c51b45b2728e7481ad34db6404c6ff724fff33 SHA-256: b8d440817ad157f14e230a5365d2a3e50011b99ce3157226325958bef0adc497
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick the user into interacting with a malicious link. The document body and embedded URLs point towards a scam related to game cheats or free in-game currency. The presence of a fake CAPTCHA heuristic strongly suggests an attempt to bypass user caution and initiate a download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-boxing-simulator-cheats-xbox-one-game-hack
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/make-free-robux_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/minecraft-java-free-account_GM479516143.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/e-free-roblox_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-obc-roblox-accounts-2021_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/roblox-robux-hack_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/claim-free-robux_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-downloading-games_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/wwwroblox-cheatgdn_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-tiktok-like_GM835599320.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/rblx-gg-robux-generator-free_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-download-play-roblox_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-robux-without-verification_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdf
    • https://elearningmts.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005168.bin
d0c3f8e31a69fc5d28a4d906b0f4591f8df388fe2295f5dfd8696855d8bc6559		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5168 27700 bytes
font_01_sfnt_off000090a9.bin
e3b0969cf536531b5e0cae184e78f4becb01ee52720b96d866a93c07b7cbc8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A9 19088 bytes

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