Malicious PDF — malware analysis report

Static analysis result for SHA-256 8561371fb78cb13f…

MALICIOUS

PDF

33.9 KB Created: 2021-06-18 18:06:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 24fd5929a66b69e7fdeb487f82e267c7 SHA-1: 235c30a170a43f99dcdfd7d8ff0197bee60ba53a SHA-256: 8561371fb78cb13f1d911a0f6744b28a6399c7b482b49f961d8f0dc09cac4b76
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 0.9980

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.co/app/431946152/gta-5-hack-roblox-game-hack PDF link annotation
    • https://foc.vn/public/upload/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/i-want-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/is-roblox-free-on-switch_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-blox-piece-hack_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_002_off00002fde.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FDE 21804 bytes
SHA-256: a0b0158de27e9e2bb22a79ee0ea8017e3d8b619f7197d7fb2a1affeac346f10d
font_01_sfnt_off00005f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9E 18896 bytes
SHA-256: 1be00acf8eb249b8d8ad588378126bbef1467f3d6a19548c6710c3b5e340d761