Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fb27319fe0d077…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 16:47:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: af1a2fb772f63a83a1cac58ef237e27d SHA-1: 6cbb9304948afa4a44a14ac402c4fabd6c036dba SHA-256: 78fb27319fe0d077ae4d3151793fdeea6a0337ccab4df687166c2eaf8ff87a38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a free generator or game hack. The primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interest in free in-game items or services to lead them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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/835599320/tiktok-followers-for-free-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-tiktok-video_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-free-online_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
stream_004_off00004ecb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ECB 24132 bytes
SHA-256: cbdeec5a80073d1e0d9a73c6b0a38cadee1dc0c28084f81956050fc8af08de70
font_01_sfnt_off00008609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8609 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9019 17692 bytes
SHA-256: 1b1e1c30a9592b0fb91196253d93c27419259905b41c1e14a3654a7d7056ebb4

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