Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ff6e5bfcb3fd46…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 09:55:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c42d3037b94ce755b7943fec346a5552 SHA-1: 20792b32ad60536920f4106c72b9182007774581 SHA-256: a8ff6e5bfcb3fd462e3753a7afba6ab5241b0eebc28406d67ce2bb0339138116
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, suggesting it is designed to redirect users to external sites. The document body and heuristics indicate a lure for game hacks and cheats, likely leading to malware downloads. The ML classifier strongly supports the malicious nature of this PDF.

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/dance-off-roblox-hack-game-hack PDF link annotation
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-often-pubg-uc-turn-into-cancer_GM1330123889.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/pokemon-go-free-pokeballs_GM1094591345.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/roblox-free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-be-all-black-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/roblox-free-download-unblocked_GM431946152.pdfIn PDF document text
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-app_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
font_00_sfnt_off000031f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F7 21980 bytes
SHA-256: c16f40d1fb9255058b41b95cbb73772f16e3fa4d920fa6b17fd7bf2f1e0ff499
font_01_sfnt_off00006289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 18824 bytes
SHA-256: 60ee4723e57f43888bbb7bd835e11bfb0fc5ecb7366a9f0a1a0773c9627ff321

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