Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c543d4d7ec36a0a…

MALICIOUS

PDF

42.2 KB Created: 2021-04-28 17:14:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: edd78d3259f5e065c1c17706ad80f819 SHA-1: 4965ecad9b4b13d25aa5cbecd4f317703d583646 SHA-256: 3c543d4d7ec36a0acba9e9e4a05a0fdcda7a221c203220f21177852816a64e6b
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 0.8953

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 https://netcdn.xyz/app/431946152/roblox-prison-life-fly-hack-game-hack PDF link annotation
    • https://www.premiumdrink.es/ckfinder/userfiles/files/free-obc-thumbnail-roblox.pdfIn PDF document text
    • https://www.premiumdrink.es/ckfinder/userfiles/files/redeem-codes-to-get-free-robux.pdfIn PDF document text
    • https://www.premiumdrink.es/ckfinder/userfiles/files/how-to-get-100-robux-on-roblox-free-2021.pdfIn PDF document text
    • https://www.premiumdrink.es/ckfinder/userfiles/files/roblox-studio-dont-mess-with-me-i-hack-your-place.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_off00003d2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D2D 26072 bytes
SHA-256: c7f488eebd98d414ec11e60c51c6f3299f0ba91d91eaa0245871d3c087e9bca2
font_01_sfnt_off000077db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 2900 bytes
SHA-256: 7709f4ae3af7d4a4200348b42e6c2c4d7e9d243aef769681d20f194ea17eaa1d
font_02_sfnt_off000081df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DF 18800 bytes
SHA-256: beb9e762362abb8515d7f69e897b8b529afdc15253331889a5dadde548b5a500

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