Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e883ada0f52d94…

MALICIOUS

PDF

52.0 KB Created: 2021-06-10 17:51:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6af0cc44f2560c5c7ec2a30602f361fc SHA-1: 5250edaf8557b51bfef799fa3125c90b83e3c133 SHA-256: 00e883ada0f52d9470ee2d7fa18b8143d0e1afc9443f5e8a3ae9c4f0d22acafd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking a link. This link, 'https://netcdn.tw/app/431946152/free-robux-instantly-no-verification-game-hack', likely leads to the download of a second-stage payload. The document also contains a large number of external PDF links, many of which point to similar scam-related content, indicating a link farm for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-robux-instantly-no-verification-game-hack PDF link annotation
    • http://sv-nahetal.de/images/coin-game_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-swat-shirt-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000554f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x554F 30084 bytes
SHA-256: cf70c4328d6c8776dd00221e414195146d301d41959ab3f602b41bb89d8b147c
font_01_sfnt_off00009a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA72C 18852 bytes
SHA-256: 645ed873f20676f16de6bb39407a08491874254ba7c26de54df75a756823139d

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