Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d64b3f97d5ed9db…

MALICIOUS

PDF

46.1 KB Created: 2021-06-08 21:01:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: aed8a502bb64e705009bbf35f8b27ae0 SHA-1: 1ecc34463b7e5caedc629cf651a192e878ac1dd1 SHA-256: 0d64b3f97d5ed9db53df5f06089296ae5c72c2089eb164918517e85f41308f4c
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a download button lure to trick users into clicking a link. The primary link directs to a malicious redirector infrastructure, disguised as a game hack generator, which is a common tactic for distributing malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/hacks-for-boku-no-legacy-alpha-2xexp-roblox-game-hack In PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-roblox-accounts-with-cheat-engine-62-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/create-a-free-roblox-picture-for-yt_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/haktuts-coin-master-free-daily-spins_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_off00005282.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5282 25532 bytes
SHA-256: 1b5865099f7f3e48f017d073747bb13ec8d22876ae009013605412f47fd5631f
font_01_sfnt_off00008e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 19420 bytes
SHA-256: 266d3bc3f2ef97c70add00ab6b2d5c7a0919eb0bd51484f01bc5ccbb31f7ca95

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