Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97f988add227a0f…

MALICIOUS

PDF

40.8 KB Created: 2021-04-27 15:33:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: afcc039ae4ec92fe7bbbfac5113ddc2c SHA-1: 993a81a405bb169493b1dd184416b0c34bad8e44 SHA-256: a97f988add227a0ff6c1bf2eaa1779030d2b7ed070c402232657d23c8c8dcc9f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document employs social engineering lures, specifically a 'game hack' and 'free generator' theme, to trick users into downloading a payload. It also instructs users to install a browser extension or update, a common tactic to bypass security controls and facilitate malware installation. The embedded URLs likely lead to the malicious payload or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.xyz/app/431946152/hiw-to-hack-miscreated-roblox-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-player-download.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-obby-gives-you-free-robux-july-no-password-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-like-botsw.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hacks-para-infinity-anime-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-shard-online-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/wall-hack-phantom-forces-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-generator-no-human-verification-2021-for-kids.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/cheat-engine-roblox-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-hack-roblox-tycoons.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/cheat-roblox-apres-la-dernire-mise--jour.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_003_off00004195.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4195 26400 bytes
SHA-256: 3e52d856523a08e9f464feb9a1352d8e6f1a876b4579f64d868f36ea97d26893
font_01_sfnt_off00007b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B77 18940 bytes
SHA-256: b6085ddf1329755f33f0a0f8885a5f4f8fb5ba005cdb49a339fa275230e5bc54

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