Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9629fb42667bbfd…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 17:33:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05331f997b0bf84e76feedf026a83afd SHA-1: 673cf25ec321dd9495936c6716fa702000903db0 SHA-256: d9629fb42667bbfdff0453b85e6aecb83265865ee49d0605b0e35da6b430f329
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many of which are designed as SEO link farms for game cheats and free currency, impersonating brands like Chase. The ML classifier and heuristic firings strongly indicate malicious intent, likely for credential phishing or to serve a second-stage payload. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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/free-working-roblox-robux-codes-2021-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/free-working-roblox-robux-codes-2021-game-hack PDF link annotation
    • http://unifieo.br/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/what-games-give-you-free-robux-no-scams_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/robux-website_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/can-cheat-engine-get-you-banned-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/play-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
stream_004_off0000509e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509E 25572 bytes
SHA-256: 99425d576bab143a584b51dc2f150beae20d7c75f2e51e1a8992595af71f0e7e
font_01_sfnt_off00008bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB1 19440 bytes
SHA-256: e087f6d7d0bf9a9dd2d79f7bcfd9f2e91f602735cfd051f0f2880ef51f0f9e8f

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