Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35064afdc4b4e25…

MALICIOUS

PDF

32.8 KB Created: 2021-07-03 21:53:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b86e20c87013bc6eb5f2bbb7bade2715 SHA-1: 4c16966ba07d17e0ed3d92912c4f95082dafd987 SHA-256: d35064afdc4b4e25b9402d9df9a8d11bdfeabbe518124795ed28769b0f3df0e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically advertising "free generators" and "game hacks" for popular games. The document body and heuristics indicate a lure to trick users into clicking these links, likely to download further malware or engage in phishing. No scripts were extracted from this sample, but the primary attack vector is the malicious redirection.

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/479516143/minecraft-svg-free-game-hack In PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/tiktok-free-like-bot_GM835599320.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/roblox-weight-lifting-simulator-3-cheat-codes_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/how-do-you-hack-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/how-to-earn-robux-without-cheats_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-youtube_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/roblox-hack-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dmgroupksa.com/uploaded_files/userfiles/files/free-robux-thumbnail_GM431946152.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_off00002e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9C 21752 bytes
SHA-256: 15299d134fcb528cc53b9f84827ed9e6e03c9b69fe7ee785f6d7b298a71cdd3b
font_01_sfnt_off00005e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6C 17968 bytes
SHA-256: f82c060a5662ddcca675aec0cfac04b32032cde6baf3a8524f802f6fcb7e6d40

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