Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b48ba5b6bb59599…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 06:46:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b7b0caa38f089e3aeac253dce6dbf24 SHA-1: 4706fd14c9e3cc89c7ec172837da23efff1ef1a8 SHA-256: 4b48ba5b6bb595993c27c1f98509be2d8a6d32b356ed31af4a0698d489220471
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 0.9865

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.online/app/406889139/free-coins-game-hack PDF link annotation
    • http://oca.undil.tl/repository/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://oca.undil.tl/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-generator-without-verification_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_004_off00005104.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5104 25392 bytes
SHA-256: 08211b3f00ab6bc9b586664b7986d06769e97508330cd7e4e62120699f6360e4
font_01_sfnt_off00008a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 17380 bytes
SHA-256: 4587a0da3d318d3aab2e4d3a2e17e88175961c64bd2fb3ac3dbf4933656e475a

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