Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaba75ab47153f0…

MALICIOUS

PDF

37.1 KB Created: 2021-07-08 16:06:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b75045ffa4a3cf810ddaaf3d0aab6837 SHA-1: ddf8d7e65a7c83fcb7dbcae50487fe67406c4b1c SHA-256: 3aaba75ab47153f099fabbaf45fe44aef30ef64c2938d2b267801327fe874fbd
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 0.9886

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 http://netcdn.tw/app/406889139/free-spins-coin-master-hack-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/how-to-affect-the-server-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/blox-land-free-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/epic-face-roblox-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-escape-the-labyrinth-roblox-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/10-robux-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-coin-master-hack_GM406889139.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_002_off0000301b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x301B 23044 bytes
SHA-256: 1bcf7ecf57357776aca97fef7a90c2a34482d8b6a07cbea7ef12a7c024c73332
font_01_sfnt_off00006410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6410 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF5 18344 bytes
SHA-256: 8bc6b0cf0eb90f04f987a5ab4f1c5f134b3d28bd64dbb5f1502a7b5244b21d6b

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