Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1f669f1b15c008…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 04:11:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e8994a05eb8815a9bb628e73204448eb SHA-1: 0f7d9301fcde5d76f1f4e271159bca403a2fcb60 SHA-256: ea1f669f1b15c008a8b04dffafbb1022b81860aacf4f17b8107fe5304931d75f
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to known malicious infrastructure. The document body, though partially corrupted, includes the same URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the primary attack pattern involves redirecting the user to a malicious URL, likely to download a second-stage payload or lead to further exploitation.

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/406889139/free-coin-and-spin-for-coin-master-game-hack In PDF document text
    • http://www.tdbaska.hr/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/nitro-fun-cheat-codes-vip-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-counter-blox-skin-hack_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-virtual-code-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-do-u-hack-into-bases-on-sharpshooter-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-download_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-inspecting-method_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-free-robux-no-human-verification-2021_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
stream_002_off0000337b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x337B 22864 bytes
SHA-256: 8bccb4645a15be969898135198ec9d97b89f23c72552bcf6b634ca6e59ea04b2
font_01_sfnt_off000066e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E7 18348 bytes
SHA-256: 2e7a314d6d80049ca784104c227b58d034e2cad44d3f1c388a0c6c6e6dc8627c

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