Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d771f7c19c061a4…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 12:19:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c9ae3c5f46dbae9c9ca8e611935e3b6d SHA-1: f2ab1dca37fe7fcf28c2fe0d4922c39f29151c06 SHA-256: 8d771f7c19c061a47cd8b4ef2bea4a551c4049aa1bb207aa3dc9ebee22297831
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate resources for free in-game currency or items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a coordinated effort to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 3

  • 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.
  • 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-spins-link-2021-game-hack PDF link annotation
    • http://lib.akpnbahtera.ac.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/robux-games_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/pokemon-go-free-and-home-transfer_GM1094591345.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005161.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5161 23732 bytes
SHA-256: f561e0b79d96ac803d16f542d1bb22d0645daf2c8154d5c8f8befcce89ac1dff
font_01_sfnt_off0000872b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872B 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9116 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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