Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0275a3ba2581c1f…

MALICIOUS

PDF

46.0 KB Created: 2021-06-08 21:58:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c23c6a44d094827b8c7ad123c50617e3 SHA-1: 07dd07a52cc6bb99b232dd3c5ecdb91b8544d9b5 SHA-256: e0275a3ba2581c1fd455ec58be6b0c69eabfd73fa4d7e10e5fae6c9a76ba9e37
162 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 and a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/como-ser-hacker-en-house-of-keys-en-roblox-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.tw/app/431946152/como-ser-hacker-en-house-of-keys-en-roblox-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/use-cheat-engine-on-roblox-tycoons_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-free-unblocked_GM479516143.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_off000052ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52EE 26876 bytes
SHA-256: 264ce7f20c8be0879d5b24844f6c437ed115c8fbef349802e488b0cd8a8258b9
font_01_sfnt_off00008ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF4 18760 bytes
SHA-256: e09b1c2745c54d6dab47eb4d4e68421859485e8066f9fb1bd8808e22d05bd8cf

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