Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2b8f8a014d17b0…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 16:34:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 28b7052ee8cb99d3c8646cf92949d126 SHA-1: 82c013d62bc8555677b3487f0de94ec8b29a5a8e SHA-256: 0c2b8f8a014d17b0b7ffff8ce748ab603244b6e8583c0d11d4b8ea6d0a6afc67
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, likely intended to direct users to malicious download sites. The document body and heuristic firings indicate a lure related to free game items, such as Robux, which is a common tactic for distributing malware. The ML classifier strongly supports the malicious nature of this PDF.

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/431946152/win-free-robux-game-hack PDF link annotation
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-hack-wizard-tycoon-2-player_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/what-pubg-uc-buy_GM1330123889.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-roblox-catalog-buyer-bot_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-pc-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-royale-high-accessories-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/robux-converter_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-how-to-get-items-for-free_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
stream_002_off00002e0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E0F 23376 bytes
SHA-256: 7c1c386550c823b7c7c3c0b2df0c6eebf28d1a20cdf3a7ad11ae89bc2179c2cf
font_01_sfnt_off000062e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E1 19036 bytes
SHA-256: 866c875b7ada575fda7e0b2d16b4e3d455f2c28d19dc14b305271f934871ca62

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