Malicious PDF — malware analysis report

Static analysis result for SHA-256 abffef78c155f1ce…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 14:45:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8cfd8604257436281ca95d847034aecb SHA-1: dd0b958f3db76c25c33ad225427e1aea82165120 SHA-256: abffef78c155f1ce6c9f46fe4cef5c32e9b655fc14028dfa3bf4d820d2193e8f
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.tw/app/431946152/how-to-get-free-robux-not-a-scam-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/easy-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-games-online_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-v3m_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-app_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/teleport-hack-roblox-lumber-tycoon-2_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
font_00_sfnt_off00002e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E61 22444 bytes
SHA-256: 71db2f0163b9f3fae72c9cc9dea873d294cd22b54bc2366db988a192234ec2da
font_01_sfnt_off00006077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6077 19244 bytes
SHA-256: 983774d3ab3dc9a6ad7d8a23e2c7ce5fcf81accc4aa13182fbdeb0a54c040bf9

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