Malicious PDF — malware analysis report

Static analysis result for SHA-256 851c5f34078c68c4…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 11:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ab05b1e9722228a147e6a01402fc3374 SHA-1: bb80e9a8b1b47bfe48de1d0d05dff336d53249f7 SHA-256: 851c5f34078c68c484a41bbf197ffb95cbe438b6f5ef25d99cf4a8aafc0587f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and other PDFs, masquerading as 'free generators' or 'game hacks'. The primary redirector URL is http://netcdn.co/app/431946152/how-to-get-free-robux-card-codes-game-hack. This indicates a phishing or scam campaign designed to lead users to further malicious content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a lure for initial access.

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/how-to-get-free-robux-card-codes-game-hack In PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-hack-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/guess-the-song-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/hack-para-zombie-rush-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/hacked-pants-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/dupe-hack-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/hack-game-pass-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-game-card-hack_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_off00003041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3041 22652 bytes
SHA-256: 871feac91101aacc1c6d278111579a030e3b453f5f2799c77c10ce7d7e529164
font_01_sfnt_off000062ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EC 19156 bytes
SHA-256: 035a858365de4c0fb6743e78998b6754e0cf104549875300bb986e595c55176a

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