Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2894f84da8f7fa1…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 13:04:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5f072f72a2301eecb1c4adca22a0ec73 SHA-1: 0d9cce649815d9d56819c9d4df1aa355c17b886b SHA-256: c2894f84da8f7fa1b3f003e5b47f3ea6ac1bac02a25f12e2d00da60111af3cf9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks, specifically for Roblox, aiming to trick users into downloading potentially unwanted applications or malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.tw/app/431946152/roblox-account-hack-unlimited-robux-apk-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/best-free-roblox-items-exploits_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-roblox-followers-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/picture-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-jailbreak-money-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-hack-generator-no-download_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-cheat-in-hole-in-the-wall-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-chrome-console_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.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_off00002fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEF 22620 bytes
SHA-256: 00db144792bad759b9dca8ca2d7b2e493f265b13dd02f939c0664ad9a357453d
font_01_sfnt_off00006239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 19632 bytes
SHA-256: 4cd709d88b59f91e531974cc587e07ffcaa303f5be55910722df671c29ecd224

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