Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c71a8063d66a51…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 20:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3792f1790a4cc14f9882329c8d172ba2 SHA-1: 0b54f02398bc887e416d6d2bc831522526891e62 SHA-256: 55c71a8063d66a518c5f79cda4101c9842a24e82c5022c82d544cc34bd1deb6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appear to be game hack generators. The primary malicious redirector URL is https://netcdn.online/app/406889139/coin-master-viking-quest-hack-game-hack. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-viking-quest-hack-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-easy-no-download_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
stream_004_off00004fb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB6 24432 bytes
SHA-256: c5766a15a293ecf72af6beae1a6d719babeb554d6a8bb4fc39ee7e02d3a88b5c
font_01_sfnt_off0000874d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874D 18436 bytes
SHA-256: cdd7d2044fff2b3d5d42961dfcf560b0c02369c6689bd16c26f5d034f53f0ba6

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