Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f2a2769c6c6b12…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 05:49:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c9aff21255a9305fcec645d6b7978c87 SHA-1: 5aa81317b8eaa9d6bc81637c730a57cd8b4070ad SHA-256: 44f2a2769c6c6b12d7f909016d04c375908f5a099e8c82793137ed6c640b2722
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 0.9865

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/406889139/fb-coin-master-free-spins-link-game-hack PDF link annotation
    • https://www.toyogas.com.tw/upload/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/pubg-uc-whatsapp-group_GM1330123889.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/pubg-uc-unlimited-free_GM1330123889.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/wurst-mc_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-village-4_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_off00005064.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5064 25468 bytes
SHA-256: b5da668487b0aadd4eddabc361f35e27dd9d5625f326f5a46445c5c10b583c35
font_01_sfnt_off00008a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7B 18212 bytes
SHA-256: a228781abc07904b27a451649b4cbec605bc7d07320168c20386cc2d173a67dc