Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb11e192b04a7c2…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 15:22:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 38d1b1d2cf38ad5022fb24f13c177bea SHA-1: fb39d45fb397fa7350ce06afde826ef62c57cf60 SHA-256: bfb11e192b04a7c2e5d0582e6265a6316d2ae7a87b3b0b8509a15bedb6aa018d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free game hacks' and 'generators' to entice users into clicking malicious links. The primary link directs to a URL associated with game cheats, which is a known tactic for distributing malware or leading to phishing sites. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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.tw/app/431946152/youtube-cheat-engine-roblox-game-hack PDF link annotation
    • http://www.elibrary.fl.unud.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-no-survey-or-human-verification_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/pokemon-go-free-evolve-with-trade_GM1094591345.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/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-coin-master-free-spin-link_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_off0000500e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500E 26100 bytes
SHA-256: 53f3cabe42ad84944b5519c0df62a88a1a209a11849b75b69c709be6f5329ca1
font_01_sfnt_off00008ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD1 18992 bytes
SHA-256: 81eee4179306d10b5dae1d2d3132729420e78df6ea278e13074041ff8686a387

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