Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a90efc73457b3f…

MALICIOUS

PDF

33.5 KB Created: 2021-06-30 10:45:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0aa45c3f450f34e29ad475ee444938e3 SHA-1: 792cb862e2ffa75d4aa11a6d4efd78e603234da6 SHA-256: c9a90efc73457b3fc74b63b4f48cbdb27be36749eb85cb7fdda046af888c35ba
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, including a primary redirector at http://netcdn.co/app/431946152/roblox-free-login-game-hack, which is associated with game hacks and generators. The document also hosts a large number of SEO-optimized PDF links, suggesting a link farm or phishing campaign designed to lure users with promises of free in-game items or currency. No scripts were extracted, but the structure and content strongly indicate a social engineering attack.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-free-login-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/best-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-have-a-coo-roblox-avatar-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/2021-free-robux-hacks-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-btools-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/change-roblox-username-pastebin-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-and-tix-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/console-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/cheat-engine-speed-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-coin-master-links-twitter_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
font_00_sfnt_off00002e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E44 22128 bytes
SHA-256: b7671b91117b2633a232406a078cce4221486d463b4fe4f7d050cfcc271112a2
font_01_sfnt_off00005ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC7 18768 bytes
SHA-256: 3ce8be4880d2e640c461e0be36dec2589727c8dce42bba909195498f293817a6

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