Malicious PDF — malware analysis report

Static analysis result for SHA-256 31de9e727aa40316…

MALICIOUS

PDF

45.2 KB Created: 2021-05-16 10:45:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9a8bdf0328cc93f5f309e7f22998b2f4 SHA-1: 5750ed7e6cdbdbfb72a36c0c945f629a2ab11e1c SHA-256: 31de9e727aa4031688bb8b8cbc48e7b144823b7c74cd4b42fb6ed1abb5ebed33
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generators' and 'game hacks' for popular games like Coin Master. The document body and embedded URLs reinforce this lure, aiming to trick users into clicking through to potentially harmful sites. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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 https://netcdn.xyz/app/406889139/coin-master-2021-free-spins-link-game-hack In PDF document text
    • http://cosver.eu/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/roblox-cp_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/www-robux_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/robux-game-com_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000498e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x498E 25796 bytes
SHA-256: 58d43b70d147c246a55ace526f9a16f6ff3f250968a2f391b6e0b5c9a63e4452
font_01_sfnt_off0000839f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839F 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D50 18456 bytes
SHA-256: b370a5eafdfb7958c61f4fc883d4c28be8b0b06276da4480d394e4923f22f18f

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