Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4791176ea84871…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 21:04:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ba674a2ff35852ddea124daa95506d63 SHA-1: 26f633cdd672c2a14e21a1b9a2a29b59e5d36b18 SHA-256: 3b4791176ea84871f341aa8f044e4fb481ae16ccd2b3be5af4879e78247778c1
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/431946152/roblox-gang-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/431946152/roblox-gang-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/how-do-you-get-free-robux-ad_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-free-gears-hat-faces-clothes_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/paste-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/creating-faces-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-money-hacks-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/2021-roblox-accounts-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-10-dollar-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/yanisalternalt-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hack-roblox-player-betaexe_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-its-free-trailer_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
font_00_sfnt_off00002edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDF 22512 bytes
SHA-256: ac172c7be9b2013c8fefb495377a1ee97ea6c2b522b79da1a8cd9676371d3eb6
font_01_sfnt_off00006163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 18484 bytes
SHA-256: 29f392fad5126cc1b661e988d151d83fa60bd2500465ef97b0a10363f3654a7c

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