Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d22e51cc8cfd5d…

MALICIOUS

PDF

44.6 KB Created: 2021-05-20 02:56:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d80594ddb79f69ed882886c664f6b1dd SHA-1: 6fb2e541df5e3c8f93e612f35101ab79a164980f SHA-256: 51d22e51cc8cfd5ddb7112f422dd0e0dcdb03d4f2021013ee16cdeb0a865f3be
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 0.9632

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/coin-master-hack-version-download-ios-game-hack PDF link annotation
    • http://possumholler.us/images/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://possumholler.us/images/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/robux-website_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://possumholler.us/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/robux-premium_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://possumholler.us/images/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/get-me-robux-for-free_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_off0000480a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480A 25156 bytes
SHA-256: a36ff829c574f2049929d7862c3fbe0a5eaba63059f2ec6744e5c6158aa34973
font_01_sfnt_off00008166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8166 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B18 18428 bytes
SHA-256: 335f604b5c7b8329e38abeae746289053e9b59feefff8f7af8842bb46b6e319b

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