Malicious PDF — malware analysis report

Static analysis result for SHA-256 38493452a14fc52b…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 18:18:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1861e29af20104facd5941aecc54b4d2 SHA-1: 14b66c91cf36b55b6435600e6d32ac2766dd71f0 SHA-256: 38493452a14fc52bd7dd5fa97e3b3b401afb961a4a1f387563c8c8622e9035cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free game items, specifically targeting 'Coin Master' and 'Roblox' players. It contains multiple embedded URLs that point to redirectors and further PDF documents, indicating a chain of lures designed to lead the user to malicious content. The ML classifier strongly flagged this sample as malicious, supporting the observed redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/coin-master-rewards-free-spins-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-money-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-2021-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-a-roblox-username_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-hak-2021-on-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-promocodes-for-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-money-cheat-jailbreak_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-daily-free-spins-link-today-facebook_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
stream_002_off000030eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30EB 23508 bytes
SHA-256: 5288a421c9efaaddb53d66387cd4b3ad1e6f5221ea2f0d2c31ba637fd6a5e2ba
font_01_sfnt_off00006619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6619 18512 bytes
SHA-256: 6bc66a7c9124691c5dbe04e2c8d08202ba1ceeb7f14ff76ef8eff16a4b1fabf8

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