Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d5d4b3d317f189…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 08:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 65b8139eb06dac845d1a2c69aaabf432 SHA-1: 8896eff28a255d1ed99230e2ecc42c0209ca02a2 SHA-256: 40d5d4b3d317f189c75b6dfffe3f94f8cf6fdf5837dee7e3fabe28389de41c45
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link to a 'free generator / game hack' which is a common lure for malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and document body content reinforce the lure of obtaining free in-game currency or hacks, directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/best-minecraft-hacked-client-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-vip-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-free-catalog-hacks-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/best-free-minecraft-skins_GM479516143.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_off00003074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3074 22048 bytes
SHA-256: c2bc04d37b00e6b73c865479cb38b15205c940ff2cb78d7e781be838f99ebd21
font_01_sfnt_off000060e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 18492 bytes
SHA-256: 86296843b88eed25728c8cc075b43780ca1cc7c9d5e807804b99454961e5616a

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