Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cf4fba0db4175d…

MALICIOUS

PDF

45.1 KB Created: 2021-05-14 06:53:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a582ba1e152d73cc0d78f574f4ffa7f0 SHA-1: 1decc9ed437164013760ea42e811d681399834bd SHA-256: f8cf4fba0db4175d32e5946cae72b0d8b5f8185eb8a4d411e0ccba8d5c7981f0
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 0.9621

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/daily-coin-master-spins-game-hack PDF link annotation
    • http://solidkom.ch/images/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/robux-get-com_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/freecoins_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/roblox-points_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-real-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_003_off00004860.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4860 25648 bytes
SHA-256: 14daa3485da9667d9e23d15ea1502f75495ee42e9bd2ad5be61699c4d14d3805
font_01_sfnt_off00008400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8400 2912 bytes
SHA-256: db212f55edd44ed73f70314c05b7bffd82bd980270bd9cba0354e7f82fc0dc3b
font_02_sfnt_off00008e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E15 18144 bytes
SHA-256: bc10b16e761ad325a331543066bfce6b0ff34f70478a358edc53294c2ec73427

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