Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd36cf93fc04cf72…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 06:15:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 245e9134391bdd95c1b912bb9350cfd9 SHA-1: 120e0d2cb87a74fe883b57a8acddec6172001c90 SHA-256: dd36cf93fc04cf72c993c92ffb0c63d5dbf9433f208cfc108e7b9b51229ee0f4
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and sites offering game hacks and cheats, indicating a lure for users to download potentially malicious content. The heuristic firings suggest the document is designed to trick users into visiting these sites, possibly to download further malware or engage in phishing. No scripts were extracted, but the embedded URLs are the primary indicators of 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/406889139/coin-master-card-collection-hack-2021-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-insert-tool-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-with-dll-injector-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-gba-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/cool-roblox-hacker-names_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-things-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/eviction-notice-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-root_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-gamepass-on-roblox-github_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/800-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-cheat-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-account-and-password-generator_GM479516143.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_002_off0000312e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312E 22980 bytes
SHA-256: 69e63d819d231c447d75d8844e8dfc720e2b75e19cfda9c71ba2789cd5ac9e66
font_01_sfnt_off000064de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 18656 bytes
SHA-256: ebe79e675d69cfb0b5c6058c2d9c6cc85a84d65455e0e2e2977962306b94f3cc

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