Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad576763b8621b9…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 01:27:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d3a3b7b90ef9bedaa13199bfe0812401 SHA-1: 17f96237a5ea8415d0b9e511e137a25d0c28bd35 SHA-256: 5ad576763b8621b9df61da8991a8adcc077e85e47982a2b6c1ca530f3be54d99
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/comment-cheat-dans-boku-no-roblox-remastered-roblox-game-hack PDF link annotation
    • https://asiavisiontreks.com/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/test-all-the-roblox-gears-free-admin_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/microsoft-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/get-robux-for-free-2021_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_off0000548a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x548A 26372 bytes
SHA-256: db50776c1e5c60ba08d8dcdcf753ab68a659d309dcf61f1eeb13e5b95dfe5e1e
font_01_sfnt_off0000901d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901D 19196 bytes
SHA-256: 56149070009ac1f30a7fa3e61c562c845f48c67aa7096b36129151e4270f8e1b

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