Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab50f5022cb09653…

MALICIOUS

PDF

34.4 KB Created: 2021-06-20 04:24:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e3e1996a4a1e4d632b9abb43000e3626 SHA-1: 0c1c8ea24f65a897db91c1c789680d7073901ffd SHA-256: ab50f5022cb09653599a65edda79f5df88133a1820e30faee8cd020ca27674b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.co/app/431946152/free-roblox-credit-codes-game-hack, which is presented as a lure for free game currency or hacks. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

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/free-roblox-credit-codes-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-minecraft-mods_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_off00002f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F82 22484 bytes
SHA-256: b67df3ce3077e05ee511422391f29971ed20e8ef3d13d0ca054c187977033175
font_01_sfnt_off00006155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 19048 bytes
SHA-256: 73f6390ca693a07047e577136524657971c0388d7d9a4f5229a0b5d2bd03fd37

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