Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1941adc4acf2ff1…

MALICIOUS

PDF

34.1 KB Created: 2021-06-20 06:36:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3c9e55077834dba4a95ae2585b587d2a SHA-1: 178e8e54d96730d5c0cc0bc438ab87b6f41cecc1 SHA-256: d1941adc4acf2ff14bd550baf1358e4f094c9fc309cac23e97f56f360235fe26
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 0.9980

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 http://netcdn.co/app/431946152/roblox-robux-hack-generator-android-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/free-robux-no-human-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-how-to-get-free-gear_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-glitch-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-redeem_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-hack-fly-jailbreak_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-apk-mod_GM406889139.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/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-gear-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-adopt-me-free-unicorn_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-avatar-items-in-roblox_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
font_00_sfnt_off00002d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D53 22560 bytes
SHA-256: 2d2d8574209a3982760cad403f1a0f4c246af4f67fa664b7f46556df92a415ae
font_01_sfnt_off00005fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC2 19196 bytes
SHA-256: 008a8370d56a99fe0cd2f8d51be9053915682d6d34928ad3a4d6fc81e46cb970

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