Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aea1ffa90ff74f…

MALICIOUS

PDF

43.2 KB Created: 2021-05-04 08:17:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2246ea1dd3aeec44aa9144ef23e8c091 SHA-1: 17982c7f955a48d51961ef8ca666e40ae775d09e SHA-256: 99aea1ffa90ff74fbcbb8a3dcd936954d2a04d9b9e4e4897fded222b4251a542
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 0.9868

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.xyz/app/431946152/free-robux-2021-october-game-hack PDF link annotation
    • https://lib.stie-yai.ac.id/repository/roblox-skywars-wins-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/best-free-roblox-exploit.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/secret-robux-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-3d-models.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-rc7-hack-scripts.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/app-hacks-para-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-robux-hacks-no-download.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/rcm-roblox-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-sign.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/como-hackear-cuentas-de-roblox-facil-y-rapido.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_off000042aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42AA 26280 bytes
SHA-256: 1c7449adad03bfc1966e69359d48ca1f3070469d6e3c06f82919726a9d8d4b66
font_01_sfnt_off00007c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C31 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000085e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E1 18520 bytes
SHA-256: a951299beec4402d7aba0951b4250c15ebb97c7a72bfa5daa9e30bb202b227b2

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