Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c28135918f723fc…

MALICIOUS

PDF

33.7 KB Created: 2021-06-19 14:34:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c3cebea32243ab96da62c94cf5922296 SHA-1: 39390d8d33b081c842f73bbd3ab1e95424b8c95d SHA-256: 4c28135918f723fc6db836380e2f2362e69a5c0a8396e8cfb0ea94b3cf325678
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are designed to trick users into downloading potentially harmful files or visiting malicious websites.

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/roblox-vehicle-simulator-money-cheat-game-hack In PDF document text
    • http://msfs-eastafrica.com/images/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-hack-other-peoples-accounts-on-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/robux-apk_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-hack-codes-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-codes-inspect-element_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-free-headphones-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/pubg-uc-18_GM1330123889.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-roblox-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/rbx-center-free-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-limiteds-for-free_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/paginas-para-hackear-roblox_GM431946152.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_off00002c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3B 21900 bytes
SHA-256: 524547f140cc06d2cd46eddf0d84fe0ccb0ac71cc670af71e0f8c0ed3beb000a
font_01_sfnt_off00005cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBA 19784 bytes
SHA-256: a316249f282b166354f725a268ce81e1a071580466d9b4d2f8db0ddf1aaeb2e5

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