Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e77fed43e5cfc7…

MALICIOUS

PDF

32.8 KB Created: 2021-07-06 20:19:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0fdf9b52be64c65f5b4639af6e1ff2e4 SHA-1: aeddf83215495bc3a34eecd8bd1179f3f272d23e SHA-256: e3e77fed43e5cfc71011d969e453bc09a17939855a5bd37e3f7c3e7d838f4538
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 0.9980

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: http://netcdn.tw/app/835599320/tiktok-free-fans-and-likes-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 http://netcdn.tw/app/835599320/tiktok-free-fans-and-likes-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-to-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/donating-free-robux-live_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-fly-cheat-tab_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-hack-on-roblox-no-email-or-no-password_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/codes-for-free-knifes-assasin-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-apk-mod-hack-download_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_off00002ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA2 21548 bytes
SHA-256: d8ec5d17c7a6463eed3d228064568df9ba4449eba957bce06c8a8d8682609ba8
font_01_sfnt_off00005dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD0 18148 bytes
SHA-256: df61d6a88d439304031c8cb0d501e1fbaeba38d81639c21ae6dcd83fd80d8aa1

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