Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad72c7fdf6da9325…

MALICIOUS

PDF

48.2 KB Created: 2021-06-08 14:45:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 128f421ac5db5b5d88bc4d505aa61f74 SHA-1: 9e552f64d9e72a451e95655fa6a8aa29bd55e5a7 SHA-256: ad72c7fdf6da932515dedcccb61170e8c215ee55ec97dcec0da85101b746a60a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' and links to external URLs, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent. No scripts were extracted, but the document's structure and linked content point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-generator-download-app-game-hack PDF link annotation
    • http://lib.teknik.unimal.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-hack-coin-master-without-root_GM406889139.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_004_off0000540f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540F 25204 bytes
SHA-256: 00aeabc453f2bb391f9af25c7c9edd94fcf4a67052867f8c682fc16bc9d2d6ad
font_01_sfnt_off00008d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6C 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000972e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x972E 19104 bytes
SHA-256: 2fa753b0111cf83572a68bba370382d7916b000f8fc705e5c94feb6813aa48e0

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