Malicious PDF — malware analysis report

Static analysis result for SHA-256 2213853d1c929854…

MALICIOUS

PDF

41.1 KB Created: 2021-05-14 11:31:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4a41caa6aeea914ae3d1ab2f72f1202a SHA-1: 06b10a41547249c86771cf8f80ecbec281abd053 SHA-256: 2213853d1c929854f00c4631c3da307c1f784536a087bd5fd7cbe6e85677ec0a
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, which is a common social engineering tactic. It contains an embedded URI pointing to a suspicious URL, likely intended to download a second-stage payload or redirect the user to a phishing site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.xyz/app/406889139/free-spins-on-coin-master-2021-game-hack PDF link annotation
    • http://mou16-murmansk.ru/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-game_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-no-verification-at-all_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_003_off0000472d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x472D 24044 bytes
SHA-256: c1022130a5a6de989a15630dbf6aea399cd3d2331f76be005f50f17d0a08dcca
font_01_sfnt_off00007e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E26 18288 bytes
SHA-256: e7fc04cebd192de8ea685c8f65a9790caba4d729d1f53b0455241ee170bde56f