Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29006e24fef079c…

MALICIOUS

PDF

42.5 KB Created: 2021-05-15 15:41:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 764cd5ae0c7dcce172b54f2dc0754ba8 SHA-1: b67d817c77aaf2018dc83540a83de0db3559b0f9 SHA-256: c29006e24fef079cb5d630d1c94cb3e22cdeb1825ab5689abede5305b3146f00
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 0.9971

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/free-spin-coin-master-twitter-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/mcpe-client_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-cheats-pc-2021_GM479516143.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_003_off00004a0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A0D 25056 bytes
SHA-256: 94155ea43290fb9a879f3b5ece22d231dfcab724e61606a469c0d8afcc3dfd85
font_01_sfnt_off00008446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 18052 bytes
SHA-256: cc1770146e69107acfb2d22bd8a11d59b0f633f34c81d2d5a2d1bbd5c5f159da

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