Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf6f5a18740c5f6…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 16:17:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0679d5f28c410a713f6df5a63b18b747 SHA-1: 1419f1d512649ec1a9a97f3b418957d0afe90466 SHA-256: 7cf6f5a18740c5f6daee0979b740292b090bed66b8803b43939036f502bacb48
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free game hacks' and generators. The ML classifier strongly indicated maliciousness, and the embedded URLs are associated with known malicious redirectors. The document body, though heavily obfuscated, contains references to these lures and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/roblox-svg-free-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/getrobux-info_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/earn-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-on-phone_GM431946152.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_off000051f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F0 24872 bytes
SHA-256: 9e8b384f3aaf75c5421e3a30c0da3126f30050c0643f63d352129f04649b7977
font_01_sfnt_off00008b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3A 4200 bytes
SHA-256: 88ac23c7afca403f5046036272c3166c6652d7fd63f21bed9d90a9ccf6a09220
font_02_sfnt_off0000990f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990F 18348 bytes
SHA-256: 82620550cff65874d98c2836b8a60b7f72357efbb651992cfb4f65634f65914f

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