Malicious PDF — malware analysis report

Static analysis result for SHA-256 379cbb6e6711c54a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 18:24:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ed3c5371f959f01474445510a1d5d317 SHA-1: 15833df9ff79c9f9c10c8b248d6921a8d2879cee SHA-256: 379cbb6e6711c54aec1e36afde5f6eb650ebd55f59c4c072817f6477acb1d42a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure for game hacks and free spins, directing users to the URL http://netcdn.tw/app/406889139/free-spins-for-coin-master-game-game-hack. This URL is flagged as a redirector for malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a phishing or social engineering attack aimed at driving traffic to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-spins-for-coin-master-game-game-hack PDF link annotation
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-tshirt-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/veil-free-download-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-cheat-engine-god-mode_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-obby-cheats_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/hack-para-tener-robux-2021-julio_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/como-hackear-roblox-y-tener-robux-infinitos_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-free-game-templates_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-do-you-get-free-robux-on-pc-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-hack-someone-on-roblox-on-phone_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-mod-apk-free-download_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-a-lua-injector-for-hacking-roblox-free_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/dl-roblox-hack-scripts-download_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-robux-and-save-it_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_off000032c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C1 22544 bytes
SHA-256: 89741b5ae409bd148b00316005c5430ce291dd7e301c0cbb59a998da3fd05555
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 18432 bytes
SHA-256: ba2b1c803cf60430fecd3a4ea667911e0c566277fb0db9da711a2662cfde09a8

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