Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c2f1660936b472…

MALICIOUS

PDF

43.8 KB Created: 2021-05-10 21:00:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8d5f93b9e33e5d8071b2b16185732b56 SHA-1: 6b4f0963d6f9ab12e2d0ee544165679e6e93d25f SHA-256: 99c2f1660936b47208b59f3970801055bc7320c22f9f8b2590dea3fa33a044c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as offers for free in-game currency and hacks. The primary lure URL is https://netcdn.xyz/app/431946152/how-to-get-free-robux-youtube-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at redirecting users to potentially malicious websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-to-get-free-robux-youtube-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-hack-no-verification_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_003_off00004bd0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD0 26880 bytes
SHA-256: 66312527b883d6db9518e0a826356050d2b8a7a4dddcabae7def73810d4f0e2e
font_01_sfnt_off00008885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8885 18444 bytes
SHA-256: c8869677d4d84c4518e8410e1128de6ae04a76f8db213e07b668dd1668cda2fe

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