Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c800fd4e1dfa27…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 12:55:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9eb2038171619893308e4c96ade779ad SHA-1: 5f38e0e53f3d80289423a886ecbe8bec7cf3d2ec SHA-256: 41c800fd4e1dfa273b7537f9c45a5d1b180dcdae9288c5771cf49173aa83795d
200 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 a link. This link, 'https://netcdn.online/app/431946152/roblox-free-wings-game-hack', redirects to a malicious site. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to lead the user to a potentially harmful resource, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox-free-wings-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-come_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-qwilfish_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-support_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_off0000513f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513F 25048 bytes
SHA-256: 0e4127fa55402b4abba469cc29492edaa45da53bc8bc9a7a9e1420dd282114e2
font_01_sfnt_off00008ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD5 18556 bytes
SHA-256: 0c6b1e6d5af6e71a5f717763afec74d9fa5a47fcdd63102494205ccdca690211

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