Malicious PDF — malware analysis report

Static analysis result for SHA-256 f965106cd2c8cacf…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 20:26:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b474e7153cddc5740ed3ebc6ded9e62a SHA-1: 40f6c97433fea7253e47a7422fbd98830be45799 SHA-256: f965106cd2c8cacfe1be6388b4d49ca3720b9512f3bcfcf268535273425e90e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a visual download button lure, strongly suggesting a phishing or scam attempt. The primary URL, http://netcdn.tw/app/406889139/coin-master-free-2021-spin-link-game-hack, indicates a lure for game-related cheats or hacks. The ML classifier also flagged this PDF as highly malicious, reinforcing the suspicious nature of the content.

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-free-2021-spin-link-game-hack In PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-inspect_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/is-it-possible-ot-use-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/how-to-mkae-hiar-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/roblox-catalog-free-oo_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-2021-february_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://elearning.miscm.id/__statics/gudangsoal/files/real-free-robux-generator_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_002_off00003086.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3086 23280 bytes
SHA-256: 9e087099252703e2ce2399cd51002bd652136eacf295b21a00e2c8f2e009f4c6
font_01_sfnt_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 18748 bytes
SHA-256: 96324e6ce0c81689c6b9eecc120e41c8c4a64b67d53a9c8495a7c5a7aa900936

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