Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cbb2b54a540747…

MALICIOUS

PDF

45.4 KB Created: 2021-06-04 06:54:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 48ba68bd58a171c1fb289dd75ff2069d SHA-1: d69d2779fea2109dc1f93c195ca8bbd1c8c06a98 SHA-256: 90cbb2b54a540747fe6b1d043b95bf4700ee3fac526dedd37177f276b87accc3
122 Risk Score

Malware Insights

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

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 0.9864

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.online/app/431946152/roblox-admin-hack-gui-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.online/app/431946152/roblox-admin-hack-gui-game-hack PDF link annotation
    • http://slim.sisminkada.net/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/corn-master_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
stream_004_off0000537e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537E 25028 bytes
SHA-256: 687ca09edfd998141e49c7bca7b74f3195da398d97295f307b2f5e0d25bbd9bf
font_01_sfnt_off00008d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D35 18876 bytes
SHA-256: dd8c242369c3070e1dad5532225e13df78b1009bc00350af4b5694fb3d29af59

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