Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c8985419a6314f…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 20:30:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3bdee4992f5b9c33c2ae4cc3951b02ea SHA-1: 449172cc3914cd2929a8daf90c9f414a0f2110bb SHA-256: b3c8985419a6314f28b6f98c5dacc8b33e5d7578eedad9f1fc7f228c0eea9add
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure and potentially malicious websites, masquerading as 'game hacks' and 'free currency generators'. The heuristic firings indicate that the PDF is designed to redirect users to known malicious sites, likely as part of a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/431946152/how-to-hack-and-get-free-robux-game-hack In PDF document text
    • http://fourieredu.cz/files/ckfinder/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-coin-master-spin-app_GM406889139.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/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/easy-robux_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/hack-coin-master-site-rssingcom_GM406889139.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_off00003213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3213 22164 bytes
SHA-256: fdc178ca1e764d7fb20dec26d273e2de8fd1246d6b5fbe727a17fa39f294a8c1
font_01_sfnt_off00006349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 19328 bytes
SHA-256: 38bb1ef0d1232593bc33faeb07ab7c9da97d5775ca686b5d0190a8681bcdbe68

Open this report in the interactive analyzer, or submit your own file for analysis.