Malicious PDF — malware analysis report

Static analysis result for SHA-256 e785fec596f31cc5…

MALICIOUS

PDF

44.2 KB Created: 2021-05-17 14:12:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83bf38765bac9d101e9b4e987eb590e1 SHA-1: b980681fe0bd3da65fbba6ccdbec817dbc916e81 SHA-256: e785fec596f31cc5e71e516ffe8dcb84cdb5b030c4ab876ed9a18796fe70b374
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 0.9648

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.xyz/app/406889139/coin-master-blogspot-game-hack PDF link annotation
    • http://www.6636.com.tw/ad6636/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-today_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-daily-spins_GM406889139.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_off00004880.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4880 24572 bytes
SHA-256: b2f9117b13cdf168c04c335703788f2820eef5c46d680a8c333913d16687eacc
font_01_sfnt_off00007fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE4 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off00008a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0F 18300 bytes
SHA-256: 856755575c1a7459373c524fcaf021c967fba3d5c4d4b4c6d782a1862ea9e167

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