Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8838cd654e1843…

MALICIOUS

PDF

48.8 KB Created: 2021-06-08 11:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1f0c6a10a97e11128123bc46d673e901 SHA-1: 55672fa8b9970ce8c63cedd0355ea670e7aa3b74 SHA-256: ec8838cd654e1843ab36762b099f059119390022b920c3413e91a760e359cc10
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically targeting users with lures for free game currency or hacks. The heuristic firings indicate the document is designed to exploit user interest in these topics to lead them to potentially harmful sites. While no scripts were extracted, the embedded links and the nature of the lures strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/want-free-robux-copy-and-paste-game-hack In PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-co_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/competition-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/are-pubg-uc-cheap_GM1330123889.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coinmaster_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-no-apps_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_off000053bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53BB 24660 bytes
SHA-256: 4a08d5e1f2016c06c41677e53011270644df16444b7822bf288335a72f6797b4
font_01_sfnt_off00008c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4C 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000098f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F4 19228 bytes
SHA-256: 477dc930e1b0294029908b62d61bffdd547d5df93a915cc98b109e4cd9c02500

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