Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e1db1d9f2ec7cd…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 10:18:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dd2180c24399690f3484da57c48e9024 SHA-1: bbbf721774e76b952bd5cb5300c2d80c0e148745 SHA-256: b1e1db1d9f2ec7cdf18e14ae0603219cb1b4b6c6be4e865a5f6f196960109438
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content-scraping operation. The document body and extracted URLs indicate a lure for free game downloads or hacks, which is a common tactic for distributing malware or unwanted software. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/minecraft-games-free-download-game-hack PDF link annotation
    • http://library.umuslim.ac.id//repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-tiktok-famous-for-free_GM835599320.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_004_off000052b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B2 25224 bytes
SHA-256: 3b4b8f82294c8992dc1ae78572e8d6a977432f3debd1d769657a07ae943d7e2f
font_01_sfnt_off00008b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5E 18548 bytes
SHA-256: ca1316f27781c6024a610b7b161693a7a162d40ad3e3bb281154e4fcfa7f8f80

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