Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ed19f5a319ae36…

MALICIOUS

PDF

36.0 KB Created: 2021-07-09 13:45:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4f7ca0a1b95d8dba53b074eea75e9341 SHA-1: 177b3b8d7746259ae22e26895ce4106c00f2107e SHA-256: 50ed19f5a319ae36f5fd9cc8d4c3ad2305ba6847b9a4587c0bbd7f6dfc01aed8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that lure users to pages offering game hacks and generators. The primary malicious link is http://netcdn.tw/app/406889139/coin-master-card-collection-hack-2021-game-hack, which is associated with known malicious infrastructure. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for further malware delivery or credential harvesting.

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-card-collection-hack-2021-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-do-i-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-game_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/hack-para-ayudar-a-la-gente-roblox_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-jailbreak-speed-hack-codes-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-hack-for-robuxs_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-apocalypse-rising-hack-dll_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-free-robux-no-verification_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_off0000347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347C 23168 bytes
SHA-256: b8f6b3a715c4f4957d1248b0ade1486c4103b6281651d433366b8c2070f1b4fe
font_01_sfnt_off000068b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B1 18656 bytes
SHA-256: ebe79e675d69cfb0b5c6058c2d9c6cc85a84d65455e0e2e2977962306b94f3cc

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