Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2988ce498f35a2…

MALICIOUS

PDF

44.1 KB Created: 2021-06-07 04:09:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd717a55ec8539d1dba1113a7d45169d SHA-1: cb889a34788e53793c94859cbb5d80ae47da484b SHA-256: 4f2988ce498f35a228bf7837f88527fe3c9c2c5571f41a4146d4652de1067dcc
82 Risk Score

Malware Insights

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

The PDF document contains a lure impersonating Facebook to trick users into clicking a link related to Roblox game hacks. The embedded link, https://netcdn.tw/app/431946152/roblox-when-i-make-game-it-say-free-sign-game-hack, is hosted on a suspicious domain and likely leads to credential harvesting or a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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/roblox-when-i-make-game-it-say-free-sign-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/roblox-when-i-make-game-it-say-free-sign-game-hack PDF link annotation
    • http://gc-sistemas.com.ar/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-domain-for-minecraft-server_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_off00004ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE3 24600 bytes
SHA-256: 778718e680d1ebbeced5cbf12c8a187fdbebe137750441bddd8186153774b071
font_01_sfnt_off0000853d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x853D 19856 bytes
SHA-256: e3a03afaac8c665630af03dd36dab24300fc2d7c9957938e23ab13cd48aaefde

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