Malicious PDF — malware analysis report

Static analysis result for SHA-256 4735b1344b2e6ebb…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 22:34:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 66360ea41590a3dd885d09eb25bd1faa SHA-1: 36c3d16e3f4fc28d582622fc0a6b44dba92efa01 SHA-256: 4735b1344b2e6ebb9cc3d9fcbce14a589772a8ba4674845cc63615f68aa5678d
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are structured as SEO-optimized links pointing to game-related hacks and generators. The primary URL, http://netcdn.tw/app/406889139/coin-master-hack-tool-pc-download-game-hack, suggests a lure for downloading potentially unwanted or malicious software. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/coin-master-hack-tool-pc-download-game-hack PDF link annotation
    • http://elib.upiyptk.ac.id/opac/repository/haxteamcf-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/can-i-wear-clothes-i-make-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/tiktok-free-fire_GM835599320.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/cheat-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/easy-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-spin-gratis-coin-master_GM406889139.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_002_off000031f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F7 22744 bytes
SHA-256: 742a44a251117a0d00e2a1dbbe72c9e0689033e46910458148a77c595291017a
font_01_sfnt_off0000651b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651B 18740 bytes
SHA-256: d36de94e3c573d64f59e77d3d9b2f8a40f11f17e05e75a4983c905ef81a5eb3f

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