Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ff7a2d1f2d22ec…

MALICIOUS

PDF

35.7 KB Created: 2021-06-26 00:09:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ac932066ac5a56a873256f698cbbd83f SHA-1: 39dd2c4c7bbb4c4bbd9971ddfc538a8502d12bf9 SHA-256: c8ff7a2d1f2d22ec35f9690c0676a11adc71232ba1837b62722ddd08b047c15e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, with a primary redirector identified as malicious. The document body and heuristics indicate a lure for potentially unwanted or malicious content, likely involving JavaScript execution for redirection or further payload delivery. The presence of a "download button" heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/ulgamesresources-com-free-robux-generator-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-with-inspect-element_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/download-cheat-roblox-mod-apk_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/pastebin-com-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-download-games-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/is-kinetic-code-going-to-be-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-into-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-apocalypse-rising-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-any-face-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off0000350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x350E 22268 bytes
SHA-256: 88d50021e347748a8f635722a0bacf9bc8d8b8de0d2a67eed20fcf688f11f1fd
font_01_sfnt_off0000667b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667B 19152 bytes
SHA-256: ebc016b40c9598ffabd4f5be84e011f625250f99972bf1d386b189eb3c9ef75f

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