Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0d23e068f13c34…

MALICIOUS

PDF

49.3 KB Created: 2021-06-03 22:05:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d7fad675fd5460a8c07c6dd0cf330f60 SHA-1: 314ca792a01f88dba213b981d6e05c42d010d7c9 SHA-256: cb0d23e068f13c34d4fe4773535768de57baa0ac6c98078d69557eee2973bf53
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are SEO-optimized PDFs promising game hacks and free currency for popular games like Roblox and Coin Master. The primary lure appears to be directing users to potentially malicious or scam-related content, as indicated by the 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though partially corrupted, contains references to these lures and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/how-to-get-free-roebucks-on-roblox-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/simplysarc_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005123.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5123 32884 bytes
SHA-256: 9366db361eaec9585301a614b5c161774fc4ff084d7798bfc2e8d06aa49ecb79
font_01_sfnt_off00009dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC8 18524 bytes
SHA-256: b7643ab87c6ede69648f322cd81a197be2475f7126f117e622ee98ccb7431d7c

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