Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6d77b507df8bbc…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 04:50:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 57146c4ffa0b3d1c3d9cb868a3474350 SHA-1: b59967921825180a13bd4fd65f2f3b506e2d2b79 SHA-256: fb6d77b507df8bbc1557a2e1c16be7f29a66494a0affbd2c9b4856d702d7cca8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to 'netcdn.tw', which is identified as a malicious redirector. The document body and heuristics indicate a lure for game hacks or free items, designed to trick users into visiting potentially harmful websites. The ML classifier strongly flagged this PDF as malicious.

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/how-to-get-free-shirts-on-roblox-game-hack In PDF document text
    • http://library.umla.ac.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-pokemon-go-joystick-2021_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/mc-update_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-hack-for-high-rank_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_off00003050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3050 23008 bytes
SHA-256: fb88f3a163e701352c4c13c10e489c7a1a0aa64d932caf1e48f4a61a0f8bbab4
font_01_sfnt_off000063db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DB 19204 bytes
SHA-256: e564b9fc2e140727ee1b3efd73c6db7bf36275a1618ea5ca2a83f85cebd447d7

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