Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e4bfe306f685d5…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 09:56:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: caf84b190563b20ebef37663ca728963 SHA-1: 15903ff344b5e28cc40f30024ca46526108771b4 SHA-256: 03e4bfe306f685d5fde0127e13b6fb5c54076016d8328b6c1db253a1336b09a7
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 0.9864

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.tw/app/431946152/robux-hack-without-human-verification-or-survey-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/instantrobux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-account-hacker-no-download_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_004_off000053c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53C9 25156 bytes
SHA-256: b9d6639903efe96c038721575bd74ea2ee9735e2728bb92a72d36c1ff2f653e2
font_01_sfnt_off00008dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFA 19524 bytes
SHA-256: 5dcb70d71bff62f70ab1da42796597b39e36a461beb208351f3eb5c6f5cff15b

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