Malicious PDF — malware analysis report

Static analysis result for SHA-256 86788c7ec1cc6072…

MALICIOUS

PDF

55.1 KB Created: 2021-05-14 03:04:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c45c40fa9c0ac8ded4653263a5838ac0 SHA-1: 6e78b54dc848f61abadc2cf7dcde2d7b573729e8 SHA-256: 86788c7ec1cc60727fe695f8a53fc0c42f9a498d842461baeb64ab64b442ea9f
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a phishing or social engineering attempt to direct users to download applications or visit scam-related websites. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of external links and the PDF structure indicate a likely attempt to exploit users through deceptive content, potentially leading to the download of malware or unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8846

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.xyz/app/431946152/roblox-apk-hack-game-hack PDF link annotation
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://ptun-kupang.go.id/new/public/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://krnl.rocksIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D70 33172 bytes
SHA-256: 46dc0e90b9a89bb5907273f3be7c5840ede015ced5b51b6d9bdb4a64e15b491d
font_01_sfnt_off00009af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF7 4092 bytes
SHA-256: df38964baa4e0a74e5ea22d342f2c8148b1deed18a65635216b04ec50cbd6ded
font_02_sfnt_off0000a8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CA 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_03_sfnt_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 18356 bytes
SHA-256: 7e836b6261bebb63fda2bc6c603fa398fe0a548bc6334e21915c3f4956160db8

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