Malicious PDF — malware analysis report

Static analysis result for SHA-256 9103a17d4df28646…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 14:23:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a40a11f030595dee6e7d3f8ba74270fc SHA-1: 9316ebdceaca8d1aa42432f614cd701fbace2edf SHA-256: 9103a17d4df286468af0d278e0903cc0422df6834ab8a268dbadfddef7ba42af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The primary URL, http://netcdn.tw/app/406889139/free-coins-coin-master-link-today-game-hack, likely leads to a malicious payload or scam page. The ML classifier also flagged this PDF with high confidence.

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/free-coins-coin-master-link-today-game-hack In PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/game-codes-eu-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-script-imputer-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-thats-free_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/hacks-no-download-for-counter-blox-roblox_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/rbx-hut_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_off000033b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B5 22764 bytes
SHA-256: 4059c23eb6d4267eac572b22e8f5bb46245381d6f764e2eaa8a7b0d9d80eb11a
font_01_sfnt_off000066cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 18524 bytes
SHA-256: 297430194eb73c4ac2f61cbe4529582c63f21c54530b07b0a2ae70a59bdd50b1

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