Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad157aaf7c8671e…

MALICIOUS

PDF

37.4 KB Created: 2021-07-03 18:28:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b4aef2e7956ab00febb92d8d76e5bbdf SHA-1: 1e0146bf0eae540349c5227ca8508945f55f1cdc SHA-256: bad157aaf7c8671e2114517e6bff631ed1f93b07c9f441743371b7b5605283a2
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related content, suggesting a lure for users to download potentially unwanted or malicious files. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the 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/free-coin-master-spins-link-download-game-hack
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spin-link-app_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id//repository/free-roblox-generator_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/free-online-games-to-play-now-roblox_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/roblox-shuts-down-when-i-open-cheat-engine_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/how-to-get-magma-fiend-in-roblox-for-free_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/free-shirt-promo-code-for-roblox_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-without-verification_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-tool-for-pc_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id/repository/free-robux-gift-card-codes-2021-no-human-verification_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/roblox-hack-free-download-for-android_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/blogger-free-spins-and-coins_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id/repository/roblox-robux-hack-tool-2021_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/hack-coin-master-online_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id/repository/games-on-roblox-that-vip-servers-are-free_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/bit-ly-free-robux-gen_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id/repository/free-robux-generator-no-human-verification-or-offers_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/where-to-get-free-robux_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/www-free-robux-com_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000394c.bin
ba6dff61b9167b53a139bfa9832aa9f8a5d6da216603f711cbc65e977d9efe33		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x394C 23344 bytes
font_01_sfnt_off00006e01.bin
27c8c61d44c060da30f6c9600d603766ffcc18b4584fd5ddfdc22e1ec1594314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 18924 bytes

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