Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1dcb9130236df2…

MALICIOUS

PDF

42.4 KB Created: 2021-05-10 19:00:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cf8224d03c739363d06c48e32d07077b SHA-1: cff160ee3dcfcc99d14d6732c6a50378a2936b74 SHA-256: 1b1dcb9130236df2206f246002ea28a815e14d3879ba5d41cfbb8eab2baa89c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising game-related benefits. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The primary malicious URL identified is https://netcdn.xyz/app/406889139/free-spins-for-coin-master-2021-game-hack, which is flagged as a redirector. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing attack.

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/free-spins-for-coin-master-2021-game-hack In PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/114-4-hacks_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_off00004621.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4621 26908 bytes
SHA-256: 63d242b1e44577e17848fba259a55c09b9fc2fa3c16b69385be3b6f44f873142
font_01_sfnt_off0000836f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836F 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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