Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c60e8bd3c97fd17…

MALICIOUS

PDF

45.6 KB Created: 2021-06-04 00:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 581e92485d53a5029b480580b0f6e3e8 SHA-1: 63d225f0dbe739b433a69497dbb535793b81b5c0 SHA-256: 4c60e8bd3c97fd1759c0ac2e3e74eae15e2cc0e5feecc413a0e0d34360e594c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'free generator / game hack' and 'free Robux'. The embedded URL, https://netcdn.online/app/431946152/hey-google-how-do-you-get-free-robux-game-hack, is identified as a malicious redirector. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a social engineering attack to drive users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/hey-google-how-do-you-get-free-robux-game-hack In PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-spins-on-coin-master-2021-ios_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_004_off00005061.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5061 26556 bytes
SHA-256: 3b4cf4c91866ef3fd00089aa2ad43aa2b123ecbcb70fd8de64b1ec3b0e7133ad
font_01_sfnt_off00008ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE2 19156 bytes
SHA-256: 2eaf05fb5b81c851c34d40d7c07e26ddd9b324a9c4f95fd917841cb6815dc612

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