Malicious PDF — malware analysis report

Static analysis result for SHA-256 45656d4a1ba3e54a…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 08:05:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 38ddd37a88d0e5d6b17caaf5112ef5a5 SHA-1: 0b8fcdce15c33abc5b50a947decd5f99295da60d SHA-256: 45656d4a1ba3e54a935dcdd91bc649ffea482f2b2a572a77521d431bb4fdde61
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free game hacks' and displays a fake CAPTCHA, indicating an attempt to trick the user into interacting with malicious content. The embedded URL, https://netcdn.tw/app/431946152/free-roblox-accountsd-game-hack, likely serves as a redirector to a malicious payload or phishing site. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it exploits PDF vulnerabilities or uses embedded JavaScript to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/free-roblox-accountsd-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/pokemon-go-free-yellow-team_GM1094591345.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/money-woodcuting-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-followers_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_004_off000052bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BC 26100 bytes
SHA-256: 73d029f1abe56755c77c89033c649a6e0e15c6457dbc6753e7e7731ade59fbf5
font_01_sfnt_off00008f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F03 18368 bytes
SHA-256: ccd21cd482e86821b2e7a8e003241ce1880af22bfddb130551e9ee8ffdce8871

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