Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c8dac2821ed04a…

MALICIOUS

PDF

35.8 KB Created: 2021-06-30 10:12:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 37c45887e095f7305a70a04292a05a69 SHA-1: 3752d789ca2706c11ed9ad44da9b5f160128b697 SHA-256: 23c8dac2821ed04a91a24d3d45632f59c6f761c351db60435fbab7564a6bc597
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free game hacks' and 'generators' to trick users into clicking malicious links. The primary link, http://netcdn.co/app/431946152/roblox-free-robux-no-verification-game-hack, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to lead the user to potentially malicious content or further downloads, aligning with a phishing or social engineering attack.

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-free-robux-no-verification-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-bc-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-adopt-me-flying-potion-roblox-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-command-tools-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-account-roblox-wiki_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-i-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-items-in-roblox-catalog-working-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-items-glitch-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-hack-download-computer_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-please_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_off00003341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3341 22952 bytes
SHA-256: 8ff1f02477a1f8ba30b9d743953fe314858247565a211696660dbbc538eba054
font_01_sfnt_off0000668e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668E 19148 bytes
SHA-256: 8dddf83a8dc305c7bfb211f3bc3fbf3b1849d9dcf887b2c8b2fcb602871e3305

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