Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfdb4cf1c316b09…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 13:10:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cadee1f2070cb2c37940c7d69725c30b SHA-1: 3377c22e9a7267e7bde9008d0b8c8c206d07f06a SHA-256: 4cfdb4cf1c316b09c5a22b17f30c07a041dcfd1d4e96fe935bde04b7945cac71
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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
  • 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/sites-to-get-free-robux-game-hack PDF link annotation
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/roblox-hax_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/are-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-daily-spin-free_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_off000053b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B5 25480 bytes
SHA-256: 2bf61c65bc515d14125653b5490a0e3252cb8f26dbf75f7e0b2f2444b51d3529
font_01_sfnt_off00008f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F26 18236 bytes
SHA-256: b3c6e6b81f0aade665b3e9e34fb665158f9d1803db8458128eb468a961d6d74b

Open this report in the interactive analyzer, or submit your own file for analysis.