Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a77ef3941eacd8c…

MALICIOUS

PDF

45.4 KB Created: 2021-05-12 06:20:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dd198cf891a5ffa737329e214ec5e7ae SHA-1: cce09cd37693bbdac562ac4cb8d04385aa55861b SHA-256: 5a77ef3941eacd8c79885a5a0a97b77f4560f3ad4a018af5cd7e63ecb1184f00
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a URL associated with game hacks and free spins, a common lure for malicious content. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves social engineering to trick users into visiting a potentially harmful site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-drop-master-free-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/rbx-sites_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/oprewards-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_off00004b6e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6E 25864 bytes
SHA-256: bb9bbfa50a9714e92c2519c9983289ba94be6d50914f52eb8a8fb920a468d1ce
font_01_sfnt_off000085d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D3 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F85 18056 bytes
SHA-256: 11f18688a2b2da9a5c9f112f1650d1ea79688667bc5daef8815cb9676fc0e265

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