Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92bc08a1daa25f9…

MALICIOUS

PDF

37.4 KB Created: 2021-07-20 07:00:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc083cd3c424342a53748c0b4c1e1102 SHA-1: 9027f2719dff5c69b0885a6d5596fdbeac1be8b1 SHA-256: b92bc08a1daa25f908b3f6dc343ffe5a6ae026e8a2cd113e57611fcecd42bd67
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 0.9216

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 http://netcdn.tw/app/406889139/coin-master-free-spin-ml-game-hack PDF link annotation
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.studiolorenzale.it/lorenzale/ckfinder/userfiles/files/daily-free-spins-coin-master_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
font_00_sfnt_off00003131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3131 23824 bytes
SHA-256: 650df0385d53bb1015f9e7d3e32f540543e5789c62d16809fe552a96c5f0d6f4
font_01_sfnt_off00006743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6743 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00007128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7128 17960 bytes
SHA-256: 444b71fec9169bc90a734dd5dd223b39b45661ce510f738c863c1de9395466a1

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