Malicious PDF — malware analysis report

Static analysis result for SHA-256 6753af40480e5e07…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 09:54:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4fd786cb2e75b5ddd9bd8ffd451416f5 SHA-1: c097f6db9525505d803a9fed7eff1bb02a46b1a5 SHA-256: 6753af40480e5e079edfad516bedcc5ed7d716fc045b9267b293c19e3711dd70
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as search engine results. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is displayed, intended to trick the user into clicking a link. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-spins-on-coin-master-without-human-verification-game-hack PDF link annotation
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-time-hack-ios_GM406889139.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/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.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_004_off00005284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5284 24412 bytes
SHA-256: 0eee4a0989d56650545c7d842cc69a6b13f94b9c8b3aeefb3446fd52eb37a1c4
font_01_sfnt_off00008986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8986 18784 bytes
SHA-256: 960842b6fe33ab0647d2f84e57a2bd0982928fead2374cfcf5cb9148229d7a4f

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