Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b559d157c76b19…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 13:20:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 65611b48b3439f42c5cf869cef6d4596 SHA-1: 7d78941d7343bb373cc88808e950edc8911164b6 SHA-256: b6b559d157c76b1945404ebebfd0b7c56326370eeee47f9e7eeda288bb1f18c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious URL, identified as a lure for game hacks. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect the user to a potentially malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/robux-for-free-script-game-hack In PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/hacks-fpt-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/www-rubux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-pc-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-not-fake_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_off000052e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E0 25236 bytes
SHA-256: 2f9b93aca5caa902134a82568db159747d830b8bcd95eca3a4da05bdfd9fa3d6
font_01_sfnt_off00008bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF5 18416 bytes
SHA-256: 0d752e501ac995e2a3411ef01de96bae06891cbf82d50b40b6eae8af41d4fede

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