Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47bf39bd9105760…

MALICIOUS

PDF

45.0 KB Created: 2021-05-13 15:10:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9b7fce3834ed3ab3b40cbd674c8b8d89 SHA-1: c07e1ad40505bb580b81ec8dc42b8cab3cb2dbdb SHA-256: d47bf39bd91057604ace2fdf31bed71b43f23ebb0588314b84a65a2e841cdf3e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-here-game-hack PDF link annotation
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-mster-free_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-just-enter-username-and-password_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_off00004a88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A88 24916 bytes
SHA-256: 7517ef0ee4b433d9d4493a890a01f0c57865ab4c60d953a4574257f09892d259
font_01_sfnt_off00008303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8303 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEC 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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