Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8590428e402d884…

MALICIOUS

PDF

49.5 KB Created: 2021-06-11 01:28:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 53c18211f9a2b72ae61ca85bf4748c40 SHA-1: 66d16f7b8efbb08978d0491beea428a6b6bcd864 SHA-256: e8590428e402d884064a9df72fc7e4f0cc8da1590b1df75fd4d191b7aa2d2bc4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure related to 'free Robux generator' and 'game hack', directing users to a malicious URL. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free game items to redirect them to potentially malicious content or download further payloads. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/roblox-roblox-hack-free-robux-generator-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/www-rbx-com_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/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-human-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-mad-city-hack-red-boy_GM431946152.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_off000051b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B4 34852 bytes
SHA-256: 66e9057a588bb6e113d5d1fc47d51478fef199f82dffee1c98cfde2476b40879
font_01_sfnt_off00009e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E81 18588 bytes
SHA-256: ddcac4f058ff78a1ba89169419d79e81ba68c7ed462b7d1846ef0729c092c99d

Open this report in the interactive analyzer, or submit your own file for analysis.