Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc5564a72ce9bdd…

MALICIOUS

PDF

37.0 KB Created: 2021-07-06 05:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89b6d5851f03efbfc11ae9b4ebf659b7 SHA-1: 471f6f61c7ae3a1c37cdfadf48df9dcffd55fb6f SHA-256: 9dc5564a72ce9bdddbfb87e9d1fda898a0063f444dd30a5729dfd8e3cff864bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous URLs advertising game hacks, with a primary URL pointing to a download for 'legit-coin-master-hack'. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to download a secondary payload. No scripts were extracted from this sample, but the overall structure and content indicate a phishing or social engineering lure.

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/legit-coin-master-hack-no-human-verification-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-accounts-2021-october_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-draw-roblox-discord_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/inside-the-world-of-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/does-the-roblox-hack-work_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/windows-roblox-hack-client-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hand-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/rbxfree-free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-card-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-2-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-fast_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_off000037d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D8 23680 bytes
SHA-256: cf89f81a0ca66f720137b32a8e187f213c676989ec626633fdc181623c19d7d5
font_01_sfnt_off00006d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D38 18540 bytes
SHA-256: 944ef90ac3957acf4ab0155e17f54942f1cad929ef859b36db5d7006f4b781e4

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