Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e311505116994f1…

MALICIOUS

PDF

45.0 KB Created: 2021-05-19 03:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 95ce8f24c7753f62d5f22a2f9cf61783 SHA-1: 7e7034cd82d7f52dd81b6d7bf100a876cbb9ae42 SHA-256: 4e311505116994f1643b5c7ef75356ddc100604c0c16284fbc5118ab4faf8078
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-get-robux-for-free-2021-game-hack. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely to deliver a second-stage payload or lead users to a credential harvesting site.

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 https://netcdn.xyz/app/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-earn_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hacks-for-gold-cards_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_003_off00004ed6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED6 27076 bytes
SHA-256: 96924906a7c6289ba69fb15af3484febfd6879ff08457472952eb7cdc373fa08
font_01_sfnt_off00008c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C64 18684 bytes
SHA-256: 65f445f0396e54760dd2a1edc1744209422bc48f29c35ea74a9bcb72e79f8b06