Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e06945c43aa6cdc…

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 09:24:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7eb0f5a3b3f5ce34c58d99e1dbd8f4db SHA-1: 9c1787fe82a6b2649508bdcc67110fa0accdf8bd SHA-256: 6e06945c43aa6cdc7d68338939b193def84fd36f2aa798ab3ffad11019b8525f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document impersonates LinkedIn to trick users into downloading a malicious file, likely a game hack, from the provided URL. The ML classifier strongly indicates maliciousness, and the presence of external URIs and a password archive lure further support this. No scripts were extracted, but the document's content and heuristics point to a phishing and download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/how-do-we-hack-on-roblox-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.tw/app/431946152/how-do-we-hack-on-roblox-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-codew_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacking-exploit-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-codes-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/commenbt-hacker-un-compte-roblox-facile_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_off0000509f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509F 26124 bytes
SHA-256: ac280b624cf3fd3c0b67d2b990567aecfe33c0748f10ff0cbf0846234f34b1a0
font_01_sfnt_off00008b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5C 18712 bytes
SHA-256: 17fcb610cd92ea2a9343fe86f6cd96b57dad338ed1b4005de9a4e7628647d3a1

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