Malicious PDF — malware analysis report

Static analysis result for SHA-256 784a71de0ca06338…

MALICIOUS

PDF

32.7 KB Created: 2021-07-09 12:52:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bedfb6a7b9a9f119935201b41a7e4892 SHA-1: ab94f05cb04a57817765942fed1e62814b7500dc SHA-256: 784a71de0ca0633821caf695eaef688b9de65c73fb6190076c9995d54302e47a
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 0.9824

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/free-robux-websites-no-human-verification-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-for-free-online-no-download_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-mad-games-free-radio_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/mining-simulator-hack-roblox-android_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/funny-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/rbx-sites_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-roblox-hair-boy_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_off0000293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293E 21888 bytes
SHA-256: 82763e123127e05ccf8133698a1c8bad21df5ba2f14b421e664b4b275a3c848a
font_01_sfnt_off000059ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59AB 19532 bytes
SHA-256: e3099c9d0ccbc2ba8291647bb1da8d0e7f9f445102052ab388bc51958bf10930

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