Malicious PDF — malware analysis report

Static analysis result for SHA-256 561922ff17932f50…

MALICIOUS

PDF

44.6 KB Created: 2021-06-11 06:50:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 018d7e84941d2585a8c1703cea5d99f1 SHA-1: c01bc82d8efae63fdf0e41f79ad9604948e9bfd2 SHA-256: 561922ff17932f502d1a2a871c03e9a5ce185377d2722748460d62258f47d69a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency and hacks, directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a potentially malicious site for further exploitation.

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.tw/app/431946152/how-to-get-free-robux-with-no-survey-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/optifine-mcpe_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-to-play-without-downloading_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-life-in-paradise-free-download_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.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_off00005158.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5158 24512 bytes
SHA-256: 45844e637a6a66bfbad35420dc2dde8befeb4b324a9354aec2fee8c395220474
font_01_sfnt_off00008989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8989 19060 bytes
SHA-256: 102f3f21cd919b0615a83e873b40d5dd62fcb73fd7eba4f33870016f36e75f61

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