Malicious PDF — malware analysis report

Static analysis result for SHA-256 be591eefe4f17fd7…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 01:31:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 703949b4309589785ff839f1417c5978 SHA-1: 99841248acf30318bb303a521c63361592f065c5 SHA-256: be591eefe4f17fd7813c97b36e143d733dc961649577d5e64f78daced4f6c251
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/appsmob.info-coinmasterhack-coin-master-hack-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-vpn-for-minecraft_GM479516143.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
stream_003_off00004904.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4904 25196 bytes
SHA-256: 8ee4fa6e2b36cf925a7e4f39f849c4fd5272d2d6b83967321f86fd43d390a308
font_01_sfnt_off00008257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 18540 bytes
SHA-256: b677ef4a6da9c58e50caa53a9ac077b56088ba41c04a0a446adbd24eace44907

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