Malicious PDF — malware analysis report

Static analysis result for SHA-256 391a30ac19d0b3bd…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 17:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dc516a861649c2176997ea36402bd736 SHA-1: e9bed8eb82aed49ddc21a1441816923e69d97e3f SHA-256: 391a30ac19d0b3bd5d1ae466e545bd0f526c425bcaf0fd67c350c22c39aa62b7
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9971

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/blox-rewards-game-hack.
  • 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.xyz/app/431946152/blox-rewards-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/simplysarc_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-coin-master-hack-no-verification_GM406889139.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_off000047ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47AB 26968 bytes
SHA-256: 7e9e32552bd2bd9dc4c06cd5b15c4e1efc286498165b813f1c89b5ae18e2f920
font_01_sfnt_off000082cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 18192 bytes
SHA-256: 9fa72324c8cea46471c46a847a072321e15136d189e875d4b903010c9f48d7ea

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