Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c5d499259d84c9…

MALICIOUS

PDF

40.7 KB Created: 2021-06-09 13:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fc8a1877ef18614b92d1773e7dd1b9cc SHA-1: c0a783eed0523a54742c1c0354fbf245135942e4 SHA-256: a5c5d499259d84c98d311a0301cf31c5118e207d795fa341fdf6045d1f4eb204
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 0.9930

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-roblox-render-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/roblox-free-robux-codes-for-ipad_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-easy-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/hack-roblox-pc-aimbot-download_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-cheat-in-roblox-find-the-doges_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/counter-blox-roblox-offensive-exploit-hacks-by-autumn_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/tradlands-roblox-cheats-tricks_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-hack-proof_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-robux-hack-console_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_off000041f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41F5 26668 bytes
SHA-256: 6ddee872d19ab030eb6652fe46d7bc900449b9c91801a5e5523eeb854372498b
font_01_sfnt_off00007d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D82 18124 bytes
SHA-256: 774ef23ecae0e692fa3b133ed80e101d6c7eaa53491a0952384015bfc035b5bb

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