Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eb5bb2ed08ae07…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 22:01:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 671427ace708b2baa5253656d6c5b7ea SHA-1: af4cace337c1568d690b0b4738d32e9e449ccece SHA-256: 85eb5bb2ed08ae075ffb40f9e85dbcf1841e9c016952b6dd6c5c916193cd1ac9
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and links to external URLs that are likely to host malicious content or further redirects. The ML classifier strongly indicated maliciousness, and the PDF_GAME_HACK_REDIRECT_LURE heuristic confirms the deceptive nature of the embedded link. No scripts were extracted, but the presence of embedded URLs and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/get-free-robux-no-human-verification-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/best-free-catalog-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-no-survey_GM406889139.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_off0000548d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x548D 29700 bytes
SHA-256: 231a3d9c10057c302df1ff3039211e82d3db8452ebe437e1279c6a6365e7aa8e
font_01_sfnt_off000096bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96BC 18860 bytes
SHA-256: 77094cb8e4b41d81131149df95963a95cd1356d500cc75fcdf894a2f9afc6be7

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