Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c7dc10921a7e7b…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 06:59:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 919b96d9267b04625ee7faeb8929fa09 SHA-1: aebc3f0bb942d65162174ad8fe6acbef282bc007 SHA-256: 09c7dc10921a7e7ba0e48bd2f057ce8d2e778283ce24b746eec4fafc26596295
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to a known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the structure and embedded links strongly suggest an attempt to trick the user into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://netcdn.tw/app/431946152/how-to-hack-pet-simulator-roblox-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/body-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-wall-hacks_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
stream_004_off000054db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54DB 25852 bytes
SHA-256: 352eb295a73cd7908ba9fa5bf867fec95175cb4f945690e50bae2b1c8862987f
font_01_sfnt_off00009100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9100 19124 bytes
SHA-256: 217bf92e1076651e5e80301acab788362e9dc0a160cc28517944e62f26e27a26

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