Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed7bab4c81fec39…

MALICIOUS

PDF

32.9 KB Created: 2021-07-03 16:37:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1bed0b26acc1d0a6a0ee1dbd2c4d0563 SHA-1: a9c0e33166508cc36cfce648118ff9707283c6a5 SHA-256: 4ed7bab4c81fec39caefa16dcced3ebdc5f5b2679cfe708fca0af96c68cb96ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links, including one identified as a malicious redirector pointing to 'http://netcdn.tw/app/479516143/minecraft-game-hack'. This URL is associated with game hack lures, suggesting a phishing or malware distribution attempt. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing 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/479516143/minecraft-game-hack In PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/robux-today_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-ooga-booga-chest-spawn-cheat_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-lumber-tycoon-money-cheat_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-how-to-get-free-robux-no-hacks-no-glitches_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/robux-come_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021-july_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/robux-place-rewards_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-ninja-blox-2-hack_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_off00003011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3011 21548 bytes
SHA-256: 0d78e2deaac4d230e13dda9eed5692c794d43c483767e4145b8ccc759ce9317a
font_01_sfnt_off00005f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F54 17856 bytes
SHA-256: 18153eb78e52d10f573a403757bf08b8b042ff0dae7dd3b4cc440df27f37a65e

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