Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad1c225caa1f361…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 17:19:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 172c386a6cbfbda13d02391205d60c40 SHA-1: 235dd12537d4032c7664fa62e3f18d820485b2b3 SHA-256: cad1c225caa1f361bee0fcfb3b2b06e9a6a5c1719976fd2e06df4c522b562eb5
200 Risk Score

Malware Insights

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

This PDF document employs a social-engineering lure related to game hacks and generators to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/431946152/hacks-in-roblox-jailbreak-2021-game-hack, points to a known malicious redirector. The document's content and heuristics suggest an attempt to exploit user interest in free in-game items to facilitate the download of a second-stage payload or the installation of malicious browser extensions.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.tw/app/431946152/hacks-in-roblox-jailbreak-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hacks-for-pc-2021-download-mods_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-make-vip-server-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/microsoft-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-costume-roblox-glitch_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-from-gor-rs_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-free-item-source-code_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/como-parecer-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-paddwords-cracker-chrome-extension_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hacks-for-tower-battles-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-dominus-rex-and-messor-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-100-robux_GM431946152.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
font_00_sfnt_off0000306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306F 21656 bytes
SHA-256: 8c84205303cee7bbe940c686ecf5b2126568d243d54b7ec23fefb714837f64c4
font_01_sfnt_off00005fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 19344 bytes
SHA-256: b5ca72aee46b2b91ed3c5b409dc68b1104661547101a1b3ad7d3d96879d361b4

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