Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e9e4af9b8b10c0…

MALICIOUS

PDF

47.8 KB Created: 2021-06-04 05:19:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6f13f9c90c1a86026bd0ff689b498f5e SHA-1: 6296c36e8877714f25fdd963cba0081cd83882fb SHA-256: 46e9e4af9b8b10c0d56dbd05ef87fb399a6733e3ed2013bd3a3200ebe41d8bc7
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks and generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' lure and instructions for password-protected archives further supports a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/free-daily-spins-from-coin-master-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/tiktok-ui-kit-free_GM835599320.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005160.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5160 25248 bytes
SHA-256: be7a6e4ca9393aa03e5cd6af75235679a175847577793e89366afeb590b5bd1c
font_01_sfnt_off00008c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0F 3440 bytes
SHA-256: b3810b78cdbcf20bc0f20163aadddac9de0488b40b1d585b23b39a3142fa9f64
font_02_sfnt_off00009775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9775 18568 bytes
SHA-256: 83a1403c7ea81f16df60b15bd3ed63af058033cc9f39ccf30f75695a9a8bc87e

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