Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9d6c1d57d22a15…

MALICIOUS

PDF

49.7 KB Created: 2021-06-13 23:37:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 81edce09aca0f213fcee6a2825d81610 SHA-1: e1a406cc20e985ff9b67e425d0d6c595b859a95a SHA-256: 9c9d6c1d57d22a15dea9418c514e8a1c665ed36b69db0a7c9a4b0462099ea0cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The document body, though heavily obfuscated, contains references to 'Program Hack Roblox' and the same malicious URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the primary attack vector appears to be a phishing attempt via a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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/program-hack-roblox-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-do-you-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/speed-run-hack-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-roblox-codd_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-unpatchable_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004f10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F10 29980 bytes
SHA-256: 011dea9c59ea9dd46885b45db7501d2b4c7172703d5f2044c4130d4023958fc2
font_01_sfnt_off00009477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9477 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E29 18884 bytes
SHA-256: b1441d3f19d6fcc5e05743beeb10dd67ceefdba3b341e24bed5ffe4d59d86822

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