Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18439a84ff9e25d…

MALICIOUS

PDF

38.2 KB Created: 2021-06-26 12:47:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a1190f0174f4790e1102159f1749260a SHA-1: 9783a47dca98a2119bf08a6f03ce2aa17f8aa6bb SHA-256: b18439a84ff9e25d6747455112eae073336cb12771beff5f78128ab8a6bfc0fe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes hacking and free in-game currency, indicating a lure for potentially malicious downloads. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of these links are present, likely to obscure the malicious intent. While no scripts were extracted, the presence of embedded URLs and the nature of the content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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-roblox-no-download-game-hack PDF link annotation
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-mgui-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-hack-into-the-buildings-of-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/roblox-free-bots_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/hacked-server-roblox-id_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-get-50k-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/cheat-tembus-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/roblox-hack-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/conseguir-robux-gratis-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-free-yourself-in-notorious-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_002_off00003cc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3CC7 22904 bytes
SHA-256: 59227e83a28c8ebfff9bd2f3f562631500f654ce2464dd8aa8b89b961b1cacb4
font_01_sfnt_off00006fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FED 19160 bytes
SHA-256: 56f4b775979fbfde9ca682cd433763fe8509577a7f0d2a58de122703ec7a63f1

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