Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6e694960b7b1bb…

MALICIOUS

PDF

32.9 KB Created: 2021-07-06 04:04:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c17a19d19f181f4f28cabc7c81cd2fd SHA-1: 04cc6b5b7f84dbbbd823eceefb119ce8e95361cb SHA-256: 8d6e694960b7b1bb667e0465dada00104399d82b55cc87e3f2e0baced26c2f15
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' or game hacks. The ML classifier strongly flagged this PDF as malicious. The document body explicitly contains a call to action, 'CLICK HERE TO ACCESS ROBUX GENERATOR', further supporting the lure. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-mod-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pubg-300-uc-price-in-india_GM1330123889.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-how-to-get-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox-online-no-download_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/ant-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-gold-cards-free_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_off00002a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0F 22172 bytes
SHA-256: bf341e28f0a23c7e47ca7ecff9121ee8b1c99a25b6aaf8251cc26fc440a0aadc
font_01_sfnt_off00005b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B88 19088 bytes
SHA-256: 3c56140fee9dfb5ded46378f21a8de948775312b2d7b3282d1f8cc46bd34fe6a

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