Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8d1da320d2b5df…

MALICIOUS

PDF

44.4 KB Created: 2021-05-14 03:06:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 25241cc32cf38b039c97f85ab47a0437 SHA-1: a6637e0f39353f83a30637d762b92281dea4d42a SHA-256: 0c8d1da320d2b5df6776d1c4f85a99eeb93d5a0e919f2b1becd6989e72f335d3
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-mod-apk-game-hack PDF link annotation
    • http://fa-deco.com/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/block-best-robux_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-online-hack-2021_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://fa-deco.com/images/coin-master-daily-free-spins-and-coins_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
font_00_sfnt_off0000495e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x495E 25080 bytes
SHA-256: 9c6d7e8b0cc30469ca902839b3a6bf5a1c75293f67c439c86c28f70b52ef5352
font_01_sfnt_off000081a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A2 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B45 18068 bytes
SHA-256: b41b00b03ce87291eba0dd85e91a6f7f7f395b53aa8529f4df5d3819e50e6afc

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