Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83f3fb32660860b…

MALICIOUS

PDF

35.0 KB Created: 2021-06-29 05:49:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aa3142aae2e4d46009d93bd0969ca996 SHA-1: 8adffae8a16db13ca4f85a9425042c79fded0bbc SHA-256: a83f3fb32660860b38ae91ebd9c19a834cae4be9e726652ac16c780695a427f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a malicious redirector link disguised as a 'free generator / game hack' lure. The link, http://netcdn.co/app/431946152/quiz-for-free-robux-game-hack, is designed to lead users to potentially harmful websites. The presence of multiple related URLs suggests a campaign focused on enticing users with free in-game items or accounts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 4

  • 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.
  • 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/quiz-for-free-robux-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-accounts-2021-november_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-legit-working-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-truly-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hack-be-other-players_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-instantly_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_off000030c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C3 22648 bytes
SHA-256: 75c4182acbb3e2d00f50dcedad3c20bcc96ac561cff8ae86222b498123b2a8fc
font_01_sfnt_off00006392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 19076 bytes
SHA-256: 8323bcca3f52d315691cde5dd4654bd75357e9378c80fd6a3a99c7d5248673f8

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