Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88ef57e438f039…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 05:17:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0ec6baa5f50f2f5773381a4fd15737bd SHA-1: 9f00529a365eb47b83bd90bff5bb23bafa74875c SHA-256: db88ef57e438f03940c3290b8d013d0ef6d967e05b3fda387c481dc017a6cf15
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses 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 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.
  • 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
  • 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/free-robux-no-password-game-hack PDF link annotation
    • http://www.library.smactf.sch.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-clothes-on-roblox-app_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/mcpe-master-coins-hack_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_off00005367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5367 24888 bytes
SHA-256: 3cde416ae0e707bce5753263c3b18dc1f77b2b9e0d73998443c8ac1d8d11e945
font_01_sfnt_off00008cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 18732 bytes
SHA-256: b254955316d184f98c6f6070526605807868e3146c8b9e5f8ca39f20861b2296

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