Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ff0ea3ccac1d70…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 03:28:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14f4e21d8cd49312362456f3286ebafe SHA-1: b0fb2275a3d25ea22cc1f9d42c19937bca228ce2 SHA-256: c8ff0ea3ccac1d70d710dba49e4a9017df40e456bce7c4f5ba7fe74ca7976e56
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains multiple embedded URLs pointing to external sites, likely for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a potential secondary stage involving encrypted payloads, though no explicit password instructions were found in the visible document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/free-robux-getter-game-hack PDF link annotation
    • https://weddingcards-expert.tw/upload/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/best-free-alternatives-to-roblox_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-spins-without-human-verification_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
font_00_sfnt_off000050b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B9 28608 bytes
SHA-256: 394188b6d218bff621baf23cb2dd472c8ac59eee33651c5e2997705fa4e623fe
font_01_sfnt_off000091bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91BF 18120 bytes
SHA-256: 086b23b7147c1a3470e531afbac4d8c2e5eda708f812742b8e2e7bfc889ce8fe

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