Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9286300fb0383d…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 18:14:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aadc88aa00202e1f1986cf65a9038569 SHA-1: 0c676e0ada9cfc3fc6d0c851e3e24112f0ddbbe0 SHA-256: aa9286300fb0383d11023641a7ec87514afd2c361610482a4ad87d6809b3b37c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating it links to a 'game hack' redirector, specifically http://netcdn.tw/app/406889139/master-coin-hack-app-game-hack. The document body and numerous extracted URLs reinforce this theme, presenting lures for game hacks and free generators. While no scripts were extracted, the PDF structure and embedded URI strongly suggest a social engineering attack to redirect users 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/master-coin-hack-app-game-hack PDF link annotation
    • https://www.sarsen.net/uploads/files/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/hack-de-restaurant-tycoon-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/app-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-download_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/good-softwares-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-fre-robux-on-a-computer_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/tiktok-free-pro-app-download_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-download-roblox-dino-simulator-hack_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_off00003419.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3419 23436 bytes
SHA-256: 34081bd87a3c8b9790d3cdca26a823081ba30a545c7d298678b1f346e84b39a3
font_01_sfnt_off000068e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E5 18180 bytes
SHA-256: 7bd10482523747762d14b11b19cc03829bec2525ea32b9abd6d12ec6249f4c5e