Malicious PDF — malware analysis report

Static analysis result for SHA-256 931f3d1535b3a419…

MALICIOUS

PDF

35.8 KB Created: 2021-06-26 23:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eabb7a65f93541773b18720765a770e0 SHA-1: a68d46790b4dd4004fe636907ec6f782b9debb6a SHA-256: 931f3d1535b3a4197eefeb26223f3fb81bd58e88d583afd93f74efaa52964cfd
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to pages offering game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/how-to-hack-knife-simulator-roblox-game-hack, likely serves as a lure to download a malicious payload. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-hack-knife-simulator-roblox-game-hack PDF link annotation
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/where-to-enter-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-promo-codes-october-2021_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-jailbreak-money-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/pokemon-go-font-free-download_GM1094591345.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/comment-avoir-un-dominus-aureus-free-ssur-roblox_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/robux-hack-no-human-verification-or-download_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/hack-para-texting-simulator-roblox-bitoneum_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-avatar-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/inject-hack-com-robux_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.

FilenameKindSourceSize
font_00_sfnt_off000032b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B3 22892 bytes
SHA-256: 4b393462c4b5a968902d8b755eb6522740f5577479463a46ea65f39c7873fbab
font_01_sfnt_off000065c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C7 19444 bytes
SHA-256: 5bfd0191c8b01d551fddc2ca833ae99332c170fe54cc93bde2ea5eae76690c79

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