Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88efe9e5f66dbd0…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 16:44:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 59e25f5444cc562013f3b629694ea147 SHA-1: e1f92b8778b9ef65710de641be18b14442e1a03f SHA-256: a88efe9e5f66dbd0b60753b22c270fc3c3ab8c7eff2c5c99c47de54b9266637a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a 'free generator / game hack' lure for Coin Master. The document body and embedded URLs reinforce this theme, pointing towards the malicious URL http://netcdn.tw/app/406889139/coin-master-game-hack. This indicates a phishing attempt to redirect users to potentially harmful content or further malware delivery.

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-game-hack In PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-hacks-for-chromebook_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/win1codez-free-robux_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/juno-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/rocash-com-earn-free-robux-by-watching-videos-and-completing_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-no-survey-or-password_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-much-pubg-uc-cost_GM1330123889.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_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
stream_002_off00003100.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3100 22784 bytes
SHA-256: 87ace52329e98d8fa06df02c9a4bf906b5a1a4fac8c6bbb5955adfad81f1be3a
font_01_sfnt_off00006411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 17836 bytes
SHA-256: 84574f8323a35f53ec0be3b5c2b4531289117d356e64a8613214cbf4efbbad2d

Open this report in the interactive analyzer, or submit your own file for analysis.