Malicious PDF — malware analysis report

Static analysis result for SHA-256 312395df5aca7b7b…

MALICIOUS

PDF

46.2 KB Created: 2021-05-10 13:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4c330a91392244e53872a6dee703541a SHA-1: 08301cb10157397f1d2dffaafff41d1a074968bc SHA-256: 312395df5aca7b7b836e8e8b03d14bfce17cb3d266472a33e24e2aea82e31d13
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA and a lure for free game items, designed to trick users into clicking a malicious link. The primary malicious URL identified is https://netcdn.xyz/app/431946152/earn-robux-today-earn-robux-today-game-hack, which is flagged as a known malicious redirector. The document's structure and content suggest it is intended to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/431946152/earn-robux-today-earn-robux-today-game-hack In PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/rbx-website_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004935.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4935 27916 bytes
SHA-256: e1a79adf6a323c78aab6df6e0b06a597290edd8ff39147897abb083f1f5cba5d
font_01_sfnt_off000087da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DA 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00009190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9190 18432 bytes
SHA-256: 50fc1adeb895ae30588f73a493889120d8bf728fc3821c38df9289c33b75de2a

Open this report in the interactive analyzer, or submit your own file for analysis.