Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35c4e6e5be94aa0…

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 04:20:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dec290df7040d38d2d82da28d6ccfd73 SHA-1: 7afda41b85c9dbd100f8d1028a3656d0adde2719 SHA-256: d35c4e6e5be94aa0bc079203e41162afdbb5e158ac20852c324cd9c3fc199fb8
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.online/app/431946152/roblox-hacked-version-download-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-hacked-version-download-game-hack PDF link annotation
    • http://librarysenior.com//repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/tiktok-fame-free_GM835599320.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-70-spin-link-today_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_off000053a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A5 26404 bytes
SHA-256: 0bbbdda78ccc478348d39081ed015ecefdeb912ed66e7cbab7409a993a0b656b
font_01_sfnt_off00008f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F90 18940 bytes
SHA-256: 045b97c0477fa0a77fe25df190f3dc8d91b636a592878cab4dc6788bf6280dbe

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