Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad9129ef46ffd84…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 18:36:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ae84839fed2e1423d7e935a3b1a9d45 SHA-1: ad0b8e9bee10adb469cef9de5d5cc7aa7758648b SHA-256: 5ad9129ef46ffd84fc927c74b0c3fc2301f3a9b081fb82c82e6d3de099a2ccc8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector lure. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest an attempt to drive users to download or interact with malicious content, likely through a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/479516143/hacker-minecraft-song-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-client_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/play-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-mobile-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_off000053ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53CA 27516 bytes
SHA-256: b0936ae04a8850a5e1b3b73ef1a5bfb369f13c93eda65f9668e19ca98eeb832b
font_01_sfnt_off0000909d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909D 18168 bytes
SHA-256: 37e3c409e679a213a10e0592b8ff177cf348fa9834d19b03b17241e7ed0c948b

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