Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9082a4bc1876e69…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 14:52:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3f6959652b4260a8f10e7d3bb6ca9692 SHA-1: c3b0adde50bcf2bf643b249e40642f3a36ac5774 SHA-256: c9082a4bc1876e69799d127d9347917d5374f5a04f5c5ce51be7f772a4e6987f
122 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and generators, presenting a fake CAPTCHA to trick users into clicking a malicious link. The embedded URL leads to a site that likely hosts further malicious content or redirects to a phishing page. No scripts were extracted, but the PDF structure and heuristics strongly indicate a social engineering attack.

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/robux-offer-wall-game-hack PDF link annotation
    • http://librarysenior.com//repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/moon-active_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/tiktok-international-free-download_GM835599320.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-ultra-attack-hack_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_off00004e5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E5A 28100 bytes
SHA-256: 348956418a6223d67738f169d0e5e64ac38bc38e0fd9613c1dc1f9705d11beee
font_01_sfnt_off00008dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 18348 bytes
SHA-256: fa82912c9e36e73f744cfc3a856a8c89ccc54bfc28e0c80a649179b290e2af39

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