Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cc004228ba9b1b…

MALICIOUS

PDF

35.9 KB Created: 2021-07-03 20:30:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d4c43c7c1bf3e285d40d41a0123b6007 SHA-1: 19fa419072b41a4bb5e04c167ae127a84efb1c9f SHA-256: e1cc004228ba9b1bec8b2ae1912ca4890af43f86392c42de74d92f78ecbdf7eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux generators' and game hacks. The primary redirector URL, http://netcdn.tw/app/431946152/free-robux-generator-no-human-verification-game-hack, is flagged as malicious. The document body and embedded URLs strongly suggest a lure for users seeking in-game currency or cheats, which is a common tactic for distributing malware or conducting phishing. No scripts were extracted from this sample.

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/431946152/free-robux-generator-no-human-verification-game-hack In PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/roblox-speed-hack-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/how-to-use-roblox-hack-scripts-free_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/cheats-for-gta-5-on-roblox-w-are-the-daves_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/hack-de-cuenta1-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_002_off0000339d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339D 22812 bytes
SHA-256: 97355d7c266f06476107d7521b1bdc244ab7d56a929b42b5ce2d11160eda3fa1
font_01_sfnt_off000066a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A1 19336 bytes
SHA-256: 1e7a5ee1c2d4ea33325644fd63b1f7e257f54daacec13fb4b037f0c912b7aa4c

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