Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21d5c769d65fbc0…

MALICIOUS

PDF

34.3 KB Created: 2021-06-20 05:32:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 41c7270a93b6ef5a478ac6313587ec52 SHA-1: 4c62a7ccc3b06f8b15a5ddd79432730564de9be7 SHA-256: f21d5c769d65fbc07b0472d0b638df1fa685f7bf0dfd59326fd7742750b6bbdb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs and a call-to-action button, luring the user towards free game currency or hacks. The primary URL, http://netcdn.co/app/431946152/free-robux-gene-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/free-robux-gene-game-hack In PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/how-dt-oget-free-robux-and-free-catilog_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/fps-roblox-free_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-sites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-youtube-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-time-hack_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_off00003155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3155 21992 bytes
SHA-256: 7b1bc573c715af75430e01edec0aa6bc9d833292bde1cc32511647c8e4736a54
font_01_sfnt_off000061d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 18716 bytes
SHA-256: 241c7495b7b7869825a77847e0d47c1d78029990e0b32ebb48689777b4105741

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