Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6697a7307a3338…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 17:58:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 80f65998682e10e3f630287273a107e8 SHA-1: ac5ff3840ef84395846dbf757693bb81fcc47770 SHA-256: bb6697a7307a3338e82e6c2b841fd75c62d955345ff7a7e5a1147066c664d886
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including one pointing to 'netcdn.tw' which is associated with game downloads. The presence of a large number of external links, many with SEO-like slugs, suggests a link farm designed to attract users with promises of free software or virtual currency. The ML classifier also strongly indicated maliciousness.

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/479516143/minecraft-dungeons-free-download-pc-game-hack PDF link annotation
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/8rsh-roblox-jailbreak-free-vip-server_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/snyapse-roblox-for-free-no-virus-still-working-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/roblox-no-download-hack_GM431946152.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
font_00_sfnt_off000032d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D0 22740 bytes
SHA-256: 36c22fdd9b528f088da1320fedeaec948f6df1833d5d928b248f794b3ec7e9c2
font_01_sfnt_off00006513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 18872 bytes
SHA-256: 05183faf73e067548e32258fc58809d25a8fef905510eff8eab59b37bb03aee7

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