Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33554ffd1ef96d6…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 21:48:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 44d8bebeb60ed5871cfd1557326f0152 SHA-1: 5c1833064b2243ad0a2fbeaf246e7c811989368d SHA-256: f33554ffd1ef96d699e19b48cc861d7837b7b8f6aae4782893ae05fa50ddbc39
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/free-coin-master-gold-cards-game-hack PDF link annotation
    • http://librarystkippgribl.com//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-polyguns-hack-credits_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-no-apps-or-surveys_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-sign-in-free_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_002_off000031eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EB 22784 bytes
SHA-256: b8ba8e982665d2dc7cd367d1f82da7d92b3ad96e36ce1df031d122a6535cce32
font_01_sfnt_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 18244 bytes
SHA-256: fd4764d50ec251cdb3a7d4efd3c62b4862a6983ebe6024ebda45eac0790d3133

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