Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca59188b6fb3d5b…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 11:04:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dcb0391fed2ee247b4e6da2009435774 SHA-1: 3e59b6e3b5603eb89c6c908485ef76471717e4a4 SHA-256: eca59188b6fb3d5b24f254f8cd73401830003ddbde27b9031f91144cf18a9e19
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains multiple embedded links that are designed to lure users into clicking on them by promising free game currency or hacks. The primary link, 'https://netcdn.xyz/app/431946152/how-to-get-free-roblox-gift-cards-game-hack', is flagged as a redirector for game hacks. The document also contains a heuristic indicating a 'Recovery secret / private key request', suggesting a potential credential harvesting attempt. No scripts were extracted, but the presence of numerous malicious links points to a phishing or social engineering attack.

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/431946152/how-to-get-free-roblox-gift-cards-game-hack PDF link annotation
    • https://yc-certify.com.tw/image/data/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/village-coin_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/robux-in_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/apps-to-get-minecraft-for-free_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
font_00_sfnt_off000049b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49B6 24992 bytes
SHA-256: 28fd6010aa97eca5d2b5b77ed47ae9ad0b6fb89e4b49f8215613d051f4abfa97
font_01_sfnt_off0000826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826D 18740 bytes
SHA-256: 4ca4edcee29dbb5ec5fd43b786ee3a040f637d4fa80ece8255e459f77acc63d1

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