Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc9768573cccc3e…

MALICIOUS

PDF

45.2 KB Created: 2021-06-04 02:31:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3e3f208a8dd49de28ea8d9ded68d4f37 SHA-1: 0f8c8dd901943af4b0edbb8b8c13b70920232014 SHA-256: 9dc9768573cccc3ecc951126923f14f8f4b43f2df25b65af5b077f2e5167e331
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking malicious links. These links, such as the one pointing to 'comment-installer-des-cheat-pvp-sur-roblox-game-hack', likely serve as a delivery mechanism for further malicious content. The presence of multiple PDF_URI and PDF_GAME_HACK_REDIRECT_LURE heuristics, along with the ML_NYX_PDF_MALICIOUS classification, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/comment-installer-des-cheat-pvp-sur-roblox-game-hack PDF link annotation
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-com-roblox_GM431946152.pdfPDF link annotation
    • http://103.30.145.97/__statics/gudangsoal/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BC 25616 bytes
SHA-256: 098ace64cdf2c2583e289885b155360b58f3c87798fa187f7ec801615fd63f6e
font_01_sfnt_off00008b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0D 19292 bytes
SHA-256: 69fc831ed13a525fc6cc6a1af431eed0dd14abcac23069788b34f521033ca851

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