Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b4ec6b0e64a908…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 16:22:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6f7cf1a9bade1eab4c80df634b0a9ddf SHA-1: 2fa95995cbaff6e7dc349a5b0d86587f9395c044 SHA-256: 31b4ec6b0e64a908b9b18b7a6a52747da49d3573409a2043106f97bbd03ce63f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-robux-for-free-2021-game-hack. This redirector is associated with lures for game hacks and free currency, indicating a phishing or scam attempt. The presence of embedded URLs and a visual download button lure further supports this malicious intent. No scripts were extracted, but the document's structure and linked content strongly suggest a social engineering attack.

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/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • https://trustindoutama.com/assets/CKImages/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/roblox-digimon-aurity-hack_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/roblox-rust-free_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/roblox-hack-2021-ios_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-hack-steal-accounts-on-roblox-apex_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/fairy-tail-online-roblox-hack_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/promo-code-hack-roblox_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/roblox-royale-high-school-hacks-de-todo_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-get-actual-free-robux-by-doing-nothing_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-get-free-gamepass-in-roblox_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/free-robuxes_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-create-your-own-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/cara-cheat-roblox-android_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://trustindoutama.com/assets/CKImages/files/lego-hack-download-roblox_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
font_00_sfnt_off00003126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3126 22068 bytes
SHA-256: 45a376b93a11f25bab8eea7a5fa8e5fbdaf8350906aab8166cfd05e9ac7184b2
font_01_sfnt_off000061f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 19384 bytes
SHA-256: de28a66561f48ef455a7e74c3d38ef737581a70ecb9f32033b07134a01356d69

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