Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b6de9e391986b3…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 12:51:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6fdd6672aaf7383956f203e7768095c6 SHA-1: 3ba07b6f4872308d69e80bfb7e01a62419ae16dc SHA-256: 45b6de9e391986b306beef0a5a0f968bac72b202c1f08beb37455209f578a45e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to known malicious redirectors, specifically advertising game hacks and generators for popular mobile games. The document body, though heavily obfuscated, contains similar URLs and references to game hacks. The presence of a 'password-protected archive handoff' heuristic suggests the document is intended to trick the user into downloading an encrypted payload, which is often a precursor to malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/coin-master-claim-spins-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-followers-on-tiktok-without-verification_GM835599320.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coin-master-spins_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_off000051d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D6 26196 bytes
SHA-256: 101302ee1531871fc7d8bca8d89a858c935d9a8f4c1ba0096cf8527bd0dd77fb
font_01_sfnt_off00008bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEF 18056 bytes
SHA-256: 910bba4e9b8698471f084902004854848b7ccdb185fd175879c14395f4b2f674

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