Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0680986dfc6e9f8…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 01:51:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2639a187020d7150461a176e19c6d0e8 SHA-1: 211cce82cf026999fc3529a4e6c91816ad193e7a SHA-256: c0680986dfc6e9f8cb26fecf12cac8871f057d0460e4800eb72c508ea7f81415
182 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a 'free generator/game hack' lure to trick users into clicking malicious links. The primary link, 'https://netcdn.online/app/431946152/robux-game-game-hack', is presented as a direct download but likely leads to a malicious site. The document also contains a large number of external links, suggesting a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/431946152/robux-game-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/is-pubg-uc-hack-possible_GM1330123889.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CE 26884 bytes
SHA-256: 3399b9c05b892602ef3f33ac4c755aee5dafa7fbf0a9af9e505c8ee0461b755b
font_01_sfnt_off00008e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6C 18340 bytes
SHA-256: c3384937c05d12942e5ee2f32f048a43efe3336dc3e7ac7a8d2adf4ff389f548

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