Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3165ed00a93334e…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 11:23:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8380b4d28276230378e8611fb79a0203 SHA-1: 7f4a300f3cadd3ab75590cfa2f50d6b0ddb183ea SHA-256: c3165ed00a93334e0caeefcccbb59c869936c9ded11e9b77097ccdad7f6395c8
200 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and displays a fake CAPTCHA, aiming to trick the user into clicking a malicious link. This link, 'https://netcdn.online/app/431946152/roblox-games-that-give-you-free-robux-game-hack', is identified as a known malicious redirector. The document's structure and embedded links suggest it's designed to facilitate the download or execution of a second-stage payload, likely through exploitation of a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-games-that-give-you-free-robux-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/bee-swarm-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-codes_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_off00005236.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5236 27892 bytes
SHA-256: 78c277642d87941076913f72e34a1e2512936adc92d9eb8687f421f3e6824008
font_01_sfnt_off000091a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A7 19240 bytes
SHA-256: af18d9cb6acc741702b59c78a5d378fdddaa2c6ad6fac2421576a1d1ac5dc213

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