Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c05425495844b1…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 12:33:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 051c3ebdc78af3fb461d441f999fa10b SHA-1: dda8705486fe7c924e0cca20dfe732274b2a6f72 SHA-256: c8c05425495844b1c03a12bc62b86f793d09b18c8e25bdfb7c710cb437bfa51e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/robux-free-roblox-generator-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/com-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mc-update_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/pubg-uc-to-pkr_GM1330123889.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-roblox-free-on-xbox-1_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-2021_GM406889139.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_off00004fed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FED 26900 bytes
SHA-256: 21bb3a1bf449eaeef7563f2a073f9c2a058738e66467726a5a951e85f8b4a351
font_01_sfnt_off00008d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5B 18420 bytes
SHA-256: a9119397948d77a64ceccb5068e22dcd5aa1bed10fec46626f1620dd2661f15c

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