Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4f4c25754d8006…

MALICIOUS

PDF

35.8 KB Created: 2021-07-09 17:00:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 78ed3c30093d7d51afbb9c85dd2d6c46 SHA-1: 0535020b0d833ff35b1d66519bdb25288e758300 SHA-256: ff4f4c25754d80069713bddf3eb0dcb2ea1a56bdee2ed6fcbf79312b88f2b79d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous URLs pointing to sites offering game hacks and cheats, including a prominent external URI to 'netcdn.tw'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it serving a malicious payload or redirecting to a phishing site. The document body, though partially corrupted, contains text related to game hacks and the 'wkhtmltopdf' generator, suggesting it was likely delivered as a malicious attachment.

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-hack-no-download-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-downloads-for-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/dowload-free-robux-hack-for-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-speed-hack-feb-4_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-no-fake_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get4mobilebiz-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-jailbreak-gui-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-jailbreak-hack-safe_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hacks-for-mm2-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-comment-avoir-des-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-unlimited-spin-hack-apk_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_002_off00003336.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3336 23696 bytes
SHA-256: 2675cdcbdebae5557bdfa68f024b278ab8de107b23bc4481b95db0b058a7c8d1
font_01_sfnt_off00006889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6889 18584 bytes
SHA-256: 63d21c21b6b581299bfa41b98ac8f0ee0c1d7d8894a5210bcadc842d74f0a609

Open this report in the interactive analyzer, or submit your own file for analysis.