Malicious PDF — malware analysis report

Static analysis result for SHA-256 e639dd63bace7f46…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 18:41:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4972965e7807078c48609868ce7ecc41 SHA-1: 2f36596d0e7aab4cfc46fbee7da54b5bd12859e3 SHA-256: e639dd63bace7f46dd6ecbdf3eb9c795e97087fd06231599391a86e75db4860a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to sites offering game cheats and free items, indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious workflow. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/jailbreak-cheat-codes-roblox-game-hack PDF link annotation
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/dark-dominus-roblox-codes-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/triangle-head-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-premium-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-cheat-exploit-juillet-2021-for-car-crusher-2_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/husky-800m-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/best-way-to-get-free-robux-legal_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/pubg-uc-mtc_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/aplicaciones-para-hackear-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/stream-snipe-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/clothing-making-software-free-roblox_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_off00002f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F87 21284 bytes
SHA-256: 4d428ec53f6b73aa1b8bb09372b36d3810975be858a3cdfd31dc2c39cb1a7577
font_01_sfnt_off00005dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFF 19384 bytes
SHA-256: 8ff9f9d08c13f020e49ca70890c75e6f1c7251c1ad93a7dd172fa824f201a651

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