Malicious PDF — malware analysis report

Static analysis result for SHA-256 b945c370c59bce90…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 07:25:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 26f8102f51a40af15a36bdb37f52cfbb SHA-1: de3f94b580d819e4880721cbde65106fd5cee5c7 SHA-256: b945c370c59bce90fde34f02afcf05a442cf546fc5f4f4302dd5c54ba1554ed0
182 Risk Score

Malware Insights

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

This PDF document contains numerous links designed to lure users into clicking on game hack generators and free item offers, impersonating brands like Microsoft. The heuristic firings indicate a link farm and a credential phishing lure. The document body, though partially corrupted, contains URLs that are likely part of this malicious scheme, aiming to redirect users to potentially harmful sites or solicit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/how-to-hack-roblox-on-mobile-game-hack.
  • 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.online/app/431946152/how-to-hack-roblox-on-mobile-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-hack-super-jump-on-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins--spins_GM406889139.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/free-coin-spin_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_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_off00005605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5605 26856 bytes
SHA-256: 4d3edf37cb2f647577c0a18522a9c27232f1732d09158624d4f89bb5d8392fe1
font_01_sfnt_off00009449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9449 18660 bytes
SHA-256: cfa1ee913d083643ff52c211c3740090c9e62a3c87f75aa46b5fb7e4e02a93ce

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