Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91761cefd3c6f91…

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 05:10:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 25bc42981e3d241020ef52645a30052c SHA-1: 40381c65b243782763f39ada38aea8a057c9a800 SHA-256: f91761cefd3c6f91ce1a383aa076cb74f82d4ce397740dbf796fa23e8f197365
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game items and hacks to trick users into clicking malicious links. The document contains multiple embedded URLs that lead to redirectors and potentially malicious PDF files, indicating a phishing or malware distribution attempt. No scripts were extracted from this sample, but the embedded links and the nature of the lure strongly suggest a malicious intent to redirect users to harmful content.

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/406889139/free-spins-for-coin-master-app-game-hack In PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-to-get-free-followers-on-tiktok-without-human-verification_GM835599320.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-script_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_off00003159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3159 23240 bytes
SHA-256: 0bc480cde6ef616b637e4ff59d493f6914bc35d6be1c8a1ff7e529f7e53c541c
font_01_sfnt_off00006588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 18176 bytes
SHA-256: 3801bf7a1deb8554b037031e06bdefc56ff30112f6b39d510dbb5cf942fa8267