Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f01aedb4c2ed17…

MALICIOUS

PDF

41.5 KB Created: 2021-05-15 09:30:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4553f20acaeed624dd357a77912a29f0 SHA-1: 314d27ed0c12b4666237afe6b965156706bce3fc SHA-256: c5f01aedb4c2ed171135630d5608206e6353ab94db5a97d20b43a79792abbca1
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are related to game cheats and hacks, indicating a lure for users to download potentially malicious content or visit phishing sites. The presence of a fake CAPTCHA heuristic further supports the deceptive nature of the document. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/get-free-lives-on-coin-master-game-hack PDF link annotation
    • https://ourlady-elearning.com/userfiles/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/robux-offers_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-unlimited-spins-hack_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_003_off000049d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D9 24180 bytes
SHA-256: 89eb3ddc8e24b9ec81170ee88e3da2784e3ff24025b61df95331c1b495873d14
font_01_sfnt_off00008138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8138 17824 bytes
SHA-256: 98e8fff89c022a83b4f395b71729b3265c44f0a4288b6eee3ecf04cc1aa00118

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