Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a8ba09428f6ff8…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 02:36:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6ad28a71a0d02a4605dffdbcca811a43 SHA-1: f0d5a2bb72661b46e1be62348ef81e5c239e9122 SHA-256: c7a8ba09428f6ff81977ac8545ecd24b440e85b57d2dee37a2e52c303cc633f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising a "Coin Master Time Hack 2021". The document body and embedded URLs suggest a social engineering lure designed to trick users into visiting these malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic firings strongly indicate malicious redirection. The primary goal appears to be directing users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-time-hack-2021-game-hack In PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/level-coin_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.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_off00004c07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C07 24592 bytes
SHA-256: 9d7a9f0c6a9b2c22812c1c3f152d2f33bfe85830ca3684c1ed8d66b22e975048
font_01_sfnt_off000083b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B7 18380 bytes
SHA-256: d61a4547520ea8cafecc3ed258c73b3244e9bc9b68d98ecd8e3226df3b2774a6

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