Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18c5b542cc019c5…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 11:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78fb5b466c39754e95ac7c988429e7d9 SHA-1: 6039f9fb4b262b02d5a7ce3266c8f6c6743a4ae1 SHA-256: d18c5b542cc019c5fc138188a717697f5c2fcfc8eaebede940330592a33b4fbc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to malicious infrastructure, specifically promoting 'game hacks' and generators. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to lure users into clicking these links. While no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/best-roblox-hacks-game-hack In PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-body-part-resize-hack_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/demogorgon-roblox-free_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-roblox-2021-unlimited-codes-for-kids_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-assassin-how-to-get-free-knives_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/prestonplayz-someone-hacked-my-roblox-account_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-hack-apk-android-download_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/minecraft-com-free_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_off000030e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E0 22264 bytes
SHA-256: 066578ceb9b0c76c059ea134eaf6c9067b7803ad7f854979754de97915d3fba9
font_01_sfnt_off0000625c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625C 18760 bytes
SHA-256: e14aca0229ecc4e5c80b50bf306c735d86496ae3d09c438880efd707b555ae7f

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