PDF malware analysis — malicious · 481c2a72cb39e713

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 20:54:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 476963dce6481d0db66f3a3a64e6176b SHA-1: 237f95e5f9f2e6fa338401fc2d660765725ba205 SHA-256: 481c2a72cb39e713f0441de57ec1619fe8b05e344b034099d62e39ff9cd6502a

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to appear as legitimate content but likely lead to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' score further supports its malicious nature. The presence of a 'download button' lure suggests an attempt to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

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.
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/coin-master-free-spin-and-coins-fbid-links-game-hack PDF link annotation
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-pastebin_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.

Filename	Kind	Source	Size
`stream_004_off00005474.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5474	25544 bytes
SHA-256: `18b2a5dc789ce39d4d85ef35b6d355a98a71d04596cfba0db4c6a6a1f347434f`
`font_01_sfnt_off00008daf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DAF	18388 bytes
SHA-256: `3cac3a67a18aefc9018cab5069c316f318df6e005a7bd0b6256086240f829048`

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