Malicious PDF — malware analysis report

Static analysis result for SHA-256 43173e57f6c2f14f…

MALICIOUS

PDF

44.9 KB Created: 2021-06-04 04:00:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b92dd1a29b55f028d649f7d47544f99d SHA-1: b5afe0dc009c77982cc6538ffe73a4a36ca0c08e SHA-256: 43173e57f6c2f14f7a18c591d3daae55bdc152ad1f2f3712b21ccef6ac14e2d3
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically promoting "free generator / game hack" lures. The presence of a fake CAPTCHA heuristic indicates the document is designed to trick users into interacting with these links, likely to download further malware or engage in scams. No scripts were extracted, but the embedded URLs and redirection heuristics strongly suggest a malicious intent to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/431946152/free-robux-site-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-coin-master-spin-in-hindi_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_off00004faf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FAF 26932 bytes
SHA-256: 765d5c4f5b7d36bd5b15d98148c85bc6de7077cb66fd1ea0d66c812cdbd53163
font_01_sfnt_off00008d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2C 18236 bytes
SHA-256: d17cd47be652198dd65b1182653c5b68eec39c9a25c2fe205f68dda680ae7be3

Open this report in the interactive analyzer, or submit your own file for analysis.