Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bf709eeb4f11d9…

MALICIOUS

PDF

44.7 KB Created: 2021-05-11 21:21:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8ecbbaa9c3ce1c85bba98df4ff09f4f5 SHA-1: f7632d98610e3f7c386a95a1416a71cd31124565 SHA-256: e1bf709eeb4f11d99f9f2a1f575b119149d2db98a6188bb5e36f03513a1c7a4c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic firing for a 'GAME_HACK_REDIRECT_LURE' pointing to a URL that promises free spins for Coin Master. The document body, though partially corrupted, also contains this URL, reinforcing the lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/get-more-free-spins-on-coin-master-game-hack PDF link annotation
    • https://www.gymun.cz/images/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/rbx-com_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/bloxpink-free-robux_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_003_off00004941.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4941 25108 bytes
SHA-256: 4d60fed21cfc705e4d2ac8e9e9e87059a1db70a1e61524cff8b8d34cb48c101e
font_01_sfnt_off00008393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8393 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D45 17884 bytes
SHA-256: bb9e4fd9c75f82cb5aaa6c3ce0f9987e8b81c815dbd48b4f27d4577a82c32b67

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