Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b076ae0c3c367f6…

MALICIOUS

PDF

43.7 KB Created: 2021-06-13 21:05:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9619a219558f2f5c37c3112ebd9ae2bd SHA-1: 42e6144d56755eb14a57712e39a5bdd510f2fbe6 SHA-256: 9b076ae0c3c367f65cff2c4e38c6548d93cc2c02ab29b27f2b786cd841614830
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 0.9969

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/is-there-an-app-to-get-free-robux-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/gernrate-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-dominus-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/strucid-aimbot_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/are-sound-ids-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-for-robux_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_003_off00004983.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4983 27076 bytes
SHA-256: 073077fb68cd846288a0dca8cd075bf6a5e62ec878710e8672c2860e6a6cdaa4
font_01_sfnt_off000087ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EF 18460 bytes
SHA-256: b84f37c0660cbc45c8a1df33d282589683165a1f016cbbeb684f5637046544d9

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