Malicious PDF — malware analysis report

Static analysis result for SHA-256 6881cd6ec0844f5c…

MALICIOUS

PDF

41.7 KB Created: 2021-05-19 02:10:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 463ff86f2c5e93ea35308a3392997da9 SHA-1: 1197611747ba9c7402a8464ee1a6aae141217c24 SHA-256: 6881cd6ec0844f5c213419e43e6bc09c2d2d90b69c3e46ab7a328e2f287f2751
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-free-spins-and-coins-2021-game-hack PDF link annotation
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-hack-app_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
stream_003_off00004711.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4711 24640 bytes
SHA-256: 5e090b214a7e4637e790c6178c1627ef4dc20e621e6153b2c116435f80a9f3d6
font_01_sfnt_off00007fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC6 18460 bytes
SHA-256: c259e1f543e24e5bfe6ce8cf601a342cc00786119f62dbfadbed712250492c46

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