Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db00507137d1dc…

MALICIOUS

PDF

33.6 KB Created: 2021-06-28 05:29:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 92e0232cf9e40b1f4e2e46cc90b5bd72 SHA-1: 0da01f2144e1f585bd21c3ddad1425233199409b SHA-256: 79db00507137d1dc35cea0deb7343ac6774e3c950ac79827d44553b8abe91753
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and other PDF files, all masquerading as game hacks and generators. The document body and heuristic firings indicate a lure for free game cheats, specifically targeting Roblox and Minecraft players. The primary attack pattern involves redirecting users to potentially malicious sites or further malicious documents, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-admin-roblox-youtube-game-hack In PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-actually-works-no-scam_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-full-throttle-hack_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-roblox-gea_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/beyond-roblox-speed-hacks_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/descargar-roblox-hackeado-para-android-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/cute-roblox-faces-for-free_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_off00002b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5B 22372 bytes
SHA-256: ac8ec2c4b89066e733c378476e6f2b34c2429f05510a46f184cc50779ce8d4a4
font_01_sfnt_off00005d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0A 19612 bytes
SHA-256: 5fffac9ee5fbd1429d667418b00297d089dbf6a187f08a6df276818965286f87

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