Malicious PDF — malware analysis report

Static analysis result for SHA-256 6279acaf8880b442…

MALICIOUS

PDF

48.4 KB Created: 2021-06-11 09:35:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b694fde6937e48398fe3f2eb0ab15884 SHA-1: 8a2e6662ac8309d3149de32920f88e2296a4902a SHA-256: 6279acaf8880b442166b332f0ccbca0217e0391516b331c78fe570cec181c0ac
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into interacting with it, which is a common lure for phishing or malware distribution. The embedded URL points to a resource that likely serves as a download for a second-stage payload. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction to initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/free-robux-ohne-handynummer-und-menschliche-ver-game-hack PDF link annotation
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/roblox-free-draw-2_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-2021-febuary-easy_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000056d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56D4 27872 bytes
SHA-256: 293e0b1455bdc10eca0fe2fe965e7cfc4263e87cbb543baaefc8754cf3868d0e
font_01_sfnt_off00009700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9700 19732 bytes
SHA-256: 7d71abc25fa19c65e8f2f0266a13f2ae0a445599126b0cd5cb421786d049eef5

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