Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544d4474fcf2594…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 18:29:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: df164504aa5f1467c155ef56d487bd13 SHA-1: cbc5344dc2007b22e182be5353651a9d7435989c SHA-256: b544d4474fcf25941f30faa03d3ece05d95bf4097a7821318acc4811518c55ea
200 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure designed to trick users into interacting with a malicious link. This link, 'https://netcdn.online/app/431946152/google-how-do-you-get-free-robux-game-hack', redirects to a 'game hack' generator, indicating a social engineering attack. The presence of multiple embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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
  • 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.online/app/431946152/google-how-do-you-get-free-robux-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/best-way-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox-to-get-robux_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_off0000522d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522D 25204 bytes
SHA-256: 431e144a0b744786276ec877a562fe0900ae081f95b16ca8c4ef543d3a1e98e3
font_01_sfnt_off00008c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C10 18972 bytes
SHA-256: 7e42234451cc840f7005e057c881a5adaeb6eb05dfbb8a23217c49a1ae6b06df

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