Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ae070dc1467a5…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 20:50:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c746a8275190af6e46f512b5cac5bc4 SHA-1: d65be31e2f9d236e37683392fa1b8fbf5ee100b4 SHA-256: e88ae070dc1467a5c1ee61b380e27af00c6654cd9fc73df8a8f24618f9570fe1
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/rbxoffers-earn-free-robux-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/rbxoffers-earn-free-robux-game-hack PDF link annotation
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-roblox-code-in-muder-mystery-2_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/robux-for-offers_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/create-free-roblox-shirts_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-18_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-admin-commands-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/golden-chain-shirt-roblox-free_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_off0000310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310D 22372 bytes
SHA-256: d5fe07cc0e64f992c72d7065a6518526b13b36f92420a9f10d1a8af02d9a8e57
font_01_sfnt_off00006325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6325 18716 bytes
SHA-256: bea0310bc4bc0781e94b7b7f27f9f885491510f4f530c0825e592a398895ac1a

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