Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf87032a85e05f0a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 18:19:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00d837c90c7086b44c12dce127c27881 SHA-1: d003745035b9c7eb71190905e3cf3646e4c695e7 SHA-256: cf87032a85e05f0a62c267c653263dac75f409167aaa0475cf3568c37cfc2f71
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 0.9980

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/free-pet-treats-coin-master-game-hack PDF link annotation
    • http://www.perpus.stfm.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-20217_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/rover-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-generator-without-verification_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_off0000330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330C 22612 bytes
SHA-256: 6e98e22c42cd7a71a4b2d8fedf6b3e1e067246663627be71001a1e374cdb2e00
font_01_sfnt_off000065b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 18152 bytes
SHA-256: 7ca706d77441b4cfcfd45ab3bb2a523490faa314971aa69b7375735f921c6ad6

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