Malicious PDF — malware analysis report

Static analysis result for SHA-256 78da3bc8b74b489e…

MALICIOUS

PDF

34.5 KB Created: 2021-06-22 19:54:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78b3da010fdfe52d6a68d7b1843718d5 SHA-1: d1402b827166e88fd16e79298fb5f778eb4ee142 SHA-256: 78da3bc8b74b489e585b66137f9718f1884c4d1d29035edd850c3222ef0eff59
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector hosted on 'netcdn.co', which is flagged as malicious infrastructure. The document body and heuristics indicate a lure for game-related cheats or currency, a common tactic for phishing or malware delivery. The ML classifier strongly supports the malicious verdict.

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.co/app/479516143/how-to-download-minecraft-hacks-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-i-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-999999-robux-tablet_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/admin-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B8 22156 bytes
SHA-256: 7b19f8352c0e2b01ebcbe5fe076006277d620e5d344ec350c97aebee56541507
font_01_sfnt_off0000629f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 18748 bytes
SHA-256: d3c6952994d6e24d3bacf5184ddbc3a45400015c11867e6fcafaa525ffd68a7f

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