Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f5cd9ce003141…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 06:34:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c00d7c69f6844784b7f697bb585349fe SHA-1: 0db988bf993737964ecabd84415ee06303feeb73 SHA-256: b67f5cd9ce00314106f69be9a3c7354d1fe7f5d8b5225cf3410cdf53ae177a9f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure designed to trick users into clicking a link. This link, 'https://netcdn.online/app/431946152/best-free-robux-sites-game-hack', leads to known malicious redirector infrastructure. The document's structure and embedded links suggest an attempt to deliver a secondary payload or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/best-free-robux-sites-game-hack In PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/tiktok-free-music-library_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.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
font_00_sfnt_off000051b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B4 25648 bytes
SHA-256: 48ef036af6e09d74da6fd6b337ee412b09cae3eeda1854828fb4dbb38d8e113f
font_01_sfnt_off00008d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D21 18236 bytes
SHA-256: 68f5330c443815a71c203001c9650c5b168215c0ad869b16e6a359c0f2b36386

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