Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84c1c08ef6aa7f4…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 17:25:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2057cfa676692cce7b6052916a747133 SHA-1: 511bcb11ccee68c988a17732b1e0fda6365c0984 SHA-256: c84c1c08ef6aa7f4a4f5e99f9f3d49a3d5e34f223e8c63743577445f32ebd86b
82 Risk Score

Malware Insights

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

The PDF document contains numerous links disguised as 'free generators' or 'game hacks' for popular games like Robux and Coin Master. These links, such as 'https://netcdn.tw/app/431946152/free-robux-giveaway-live-stream-now-game-hack', are designed to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a lure for a 'download button' reinforces the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-giveaway-live-stream-now-game-hack PDF link annotation
    • http://ff-klaffenbach.de/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/whats-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-roblox-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-free-download-iphone_GM479516143.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_004_off00004f9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9C 26700 bytes
SHA-256: 781f83614112c7c52dbad7fb4814652bb0328a47997d6f1e81896d2e572f120a
font_01_sfnt_off00008c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5B 19184 bytes
SHA-256: cc804913b2c78fb77d27b3ba82f72ffe035beb1b0c9f996836593cfb18b26508

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