Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e5f81e5dc03783…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 05:07:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d97fb1e78973e13c70f8cbff1d63079e SHA-1: 661ee39bf9a10656823b0fb6d12d91c160af92e2 SHA-256: 34e5f81e5dc0378304f93c60721ccb5c4ab44ea67d01a79f80eb9d07056ffba8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links and a lure for 'free Minecraft Gift Card' and game hacks, directing users to potentially malicious websites. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the use of a game hack redirector lure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to deliver a second-stage payload or phish for credentials.

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/479516143/free-minecraft-gift-card-game-hack PDF link annotation
    • http://stikgiamakassar.ac.id/digilib/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/robux-website_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/pubg-uc-vn_GM1330123889.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-roblox-card-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-robux-robux-king_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-robux-giftcard-may-2021_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-many-tiktok-free-accounts_GM835599320.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
font_00_sfnt_off00003154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3154 22544 bytes
SHA-256: 2519ae7921e189f5ca7a6ec0905153da6cd1853d6a98965e5d28abe01f5fce85
font_01_sfnt_off0000637c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637C 18028 bytes
SHA-256: 4a3c9b0af9a1c9a28351056b4340472f9d26aba17cec2b4ebc491c0840baf217

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