Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68c6158b6c69728…

MALICIOUS

PDF

52.5 KB Created: 2021-06-07 14:48:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 78f929b43834951f7036554d6033abae SHA-1: 2baa72b5f4a41928a983512b8df450ccf0da2850 SHA-256: e68c6158b6c69728afd128bc5a05f83d29517b8bf84c6edbb17d41e6c6651296
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising free generators for popular games like Roblox and Minecraft. The primary lure URL is https://netcdn.tw/app/431946152/download-free-cool-roblox-boy-outfits-game-hack, which is associated with malicious redirector activity. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to trick users into downloading further malicious content or visiting malicious sites, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

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.tw/app/431946152/download-free-cool-roblox-boy-outfits-game-hack In PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-but_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/is-minecraft-bedrock-free_GM479516143.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_004_off00005313.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5313 31908 bytes
SHA-256: 7c6ac12f98aaff6bb6793909c8cfbc5885b86eda9d0e6122c802b70a5aebab5a
font_01_sfnt_off00009a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7AC 19224 bytes
SHA-256: 67ac2484dec312966b31770c769006733cacda595b52cee3220f1b69cd537c54

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