Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b9c7f471ea606…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 23:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 18b628f89ccbd6377f1bc2fd95b52e06 SHA-1: e1c02a63577998191ab7a15e6959c6a8d670b2d3 SHA-256: c98b9c7f471ea60668e6389caaa2f08c9d1d73c2dcf897fd8b4c75970dfc199e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a direct link to a known malicious redirector, disguised as a 'free generator' for Roblox Robux. This lure is designed to trick users into visiting the malicious URL, which likely leads to further malware delivery or phishing. The document body and embedded URLs reinforce this lure, aiming to exploit interest in free in-game items.

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.co/app/431946152/calling-roblox-to-get-free-robux-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/in-roblox-how-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-hack-2021-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-elemental-battlegrounds-hack_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/dragon-ball-flaming-path-hack-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/skywars-roblox-how-to-get-free-mega-vip_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-can-i-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-java-edition-download-free_GM479516143.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_off00003170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3170 22432 bytes
SHA-256: 16c729d2724cbaaefa087c49a08d238af285a0b42fd74be31cd1ce2625050c98
font_01_sfnt_off0000638c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 19012 bytes
SHA-256: 1f3d9e416cd4433fea7bdebc6b1aecd9c07ff69f440f95f2878789def13bb198

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