Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1a5cd91ae788df…

MALICIOUS

PDF

41.9 KB Created: 2021-05-16 09:24:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 83ae576047bba1f4dcee59d6cd7c3e78 SHA-1: d065c206489049b54b206d4356368b3c2c758cf3 SHA-256: 6c1a5cd91ae788dffcef018a64c8818d5d74c0fab40a1fdc0ffbac934f759e89
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL and numerous other links point to sites offering game-related cheats and currency, suggesting a social engineering tactic to deliver a payload. The ML classifier also strongly indicated maliciousness.

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/431946152/free-robux-gift-card-codes-2021-game-hack PDF link annotation
    • http://solidcom.de/images/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://solidcom.de/images/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://solidcom.de/images/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://solidcom.de/images/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://solidcom.de/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://solidcom.de/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://solidcom.de/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://solidcom.de/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://solidcom.de/images/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://solidcom.de/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://solidcom.de/images/robux-gift-card-free_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_off00004679.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4679 24668 bytes
SHA-256: 64121cf4ea9c717396fa22d5766f2d8ec6750660c888eee3c099e4a0e175f1c3
font_01_sfnt_off00007ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF7 19044 bytes
SHA-256: a83203ba6d4d8e4db234da74518c811315008a13a6a61ff598d06d89853e7c2b

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