Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ce97534a803414…

MALICIOUS

PDF

46.8 KB Created: 2021-05-19 14:34:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3210a975f3c5c83fc751be3d85a22daf SHA-1: d9103105fb9963c15176c65722f366891a748a25 SHA-256: f3ce97534a803414683ff32f4a790587eacdda1501d131af7d6ab122ba6d972f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm designed to redirect users to potentially malicious sites, specifically mentioning 'free generator / game hack' lures. The document body, though heavily obfuscated, contains URLs that align with this 'game hack' theme. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/free-coins-coin-master-blog-game-hack PDF link annotation
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-today_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gamardelli.com.br/images/ckfinder/files/free-robux-pin-codes_GM431946152.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_off00004b5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5C 25916 bytes
SHA-256: 36b8e066e85f288ddc47c6a2c63e2cb17ffb7cce2af0e0a449a60304535b9343
font_01_sfnt_off0000866c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866C 4180 bytes
SHA-256: f8b508d1e0742aaacc2d7a830d5112831ea7d03e612f73d83feebff75c0521c6
font_02_sfnt_off00009488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9488 18288 bytes
SHA-256: 525699ae71861fffeab431a07c950b4914d38a871fb98becad0e0bea9ac3f1df

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