Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5dbf7a7146f2a2…

MALICIOUS

PDF

42.6 KB Created: 2021-05-19 07:27:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5d3cfdb848760014b0b1b91bea93b16d SHA-1: 0b21b0b0077b34ee4a56782feba977bab3608d1e SHA-256: 5a5dbf7a7146f2a2a9c19e31f8b41f95a8bf65a2ba176b710409b4d033fd86e6
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious links. The primary link, 'https://netcdn.xyz/app/431946152/free-roblox-accessories-game-hack', is associated with game hack generators, a common pretext for malware delivery. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction, likely leading to a second-stage download or exploit. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-roblox-accessories-game-hack PDF link annotation
    • http://szekelymozes.ro/images/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-game_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-link-2021_GM406889139.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_003_off000049d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D7 25832 bytes
SHA-256: 107fb394f6913c7af13e47ceb8a64171dd4a25077b8ebdf1a0a378cf6d9ea267
font_01_sfnt_off000084f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F4 18068 bytes
SHA-256: b7fafcf614b1abbd80a891683bfb0ea6d0303dc117aefa34ccf671ed5cc38e77

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