Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f9e5a5a9d32ef6…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 07:41:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8dbbb9e58d753169ec9b0ca887bcef29 SHA-1: 6ffda484609de99b4cc56242a4a6767c6c01a477 SHA-256: 23f9e5a5a9d32ef663a792f83f64670b9fc51d0568246ac92316da72264dc61f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically advertising free generators for games like Coin Master and Roblox. The embedded URL http://netcdn.tw/app/406889139/blogspot-free-spins-coin-master-game-hack is identified as a malicious redirector. While no scripts were explicitly extracted, the nature of the lure and the redirector suggests an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/blogspot-free-spins-coin-master-game-hack In PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-hack-tool-no-verification_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/wow-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-hack-robux-2021-unlimited-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/wild-revolvers-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/hack-survive-the-diasters-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-free-adverts_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-free-avatar-animations_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/camera-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-stuff-on-roblox-catallog_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/generator-free-robux-facil_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/hack-robux-free-pastebin_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e8d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E8D 22724 bytes
SHA-256: acb65493bfa3e5d8067f200fc43136c20641b74cae1a0ed5c3e5ca3e51677683
font_01_sfnt_off00006161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 18464 bytes
SHA-256: 230ca97f16dd2ddf1879142f15263642e6919db147f0bcf840325c8143f28d8e

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