Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91b86b247d13fbc…

MALICIOUS

PDF

42.6 KB Created: 2021-05-19 01:32:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 278234bff750e4cd326ec1d693e4a4a7 SHA-1: 7de37440c9311eebe3a345c6a321a04b3f0e498a SHA-256: f91b86b247d13fbc86bc8e7753f345cc9546deff3571be83a77da6bb407499df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the lure of free game-related content suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/minecraft-for-free-games-game-hack In PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/20210-robux_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn35.net/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn35.net/__statics/gudangsoal/files/earn-free-robux-on-roblox_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_003_off00004b61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B61 25268 bytes
SHA-256: 3c93ed91d253c98cb12cc7f44b130ab987620bbd858450f3944ab170dcf2136d
font_01_sfnt_off00008565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8565 17968 bytes
SHA-256: 9a9d2dfa5c0c54fa5ffdde25f1de4b21c6a9e15afbe55fd2a9ef8b08bad6b0a2

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