Malicious PDF — malware analysis report

Static analysis result for SHA-256 6383c935bf99c563…

MALICIOUS

PDF

44.6 KB Created: 2021-06-14 01:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: de2f4e0469213449dcd7f839084d193f SHA-1: b9d6b39f9c0712cd05fa02e3fb0b19311aafffdc SHA-256: 6383c935bf99c563ddfa601014c10794dcaa23b908707be246cfd9c66ec74959
200 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency and displays a fake CAPTCHA to trick users into clicking malicious links. The primary link directs to a known malicious redirector, which likely serves as a gateway to further malicious content or exploits. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to exploit user interaction for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-unlimited-robux-by-hacking-game-hack In PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/tiktok-free-8-ball-pool_GM835599320.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-easy-fast_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-apocalypse-rising-spawn-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/collect-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/when-will-welcome-to-bloxburg-be-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-clothes-on-roblox-without-bc_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/haktuts-coin-master-free-spin-link_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_003_off00004b05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B05 25832 bytes
SHA-256: f7825ec1c15b38799b884a4c18ac436c724e4a7d5ffbf26e74a071a0d5c690e2
font_01_sfnt_off00008701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8701 19964 bytes
SHA-256: e174b3455f702fa6cf6f113b4f1ec1b04e75543cd077213f38ef16641f334d22

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