Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9341959b4a38959…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 06:09:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e88fda485981123faa9cac6df60ac0f1 SHA-1: 4cd3bc99b045c3fcd30d887fa47089722924d7c8 SHA-256: d9341959b4a38959f5bb8c57b22c74b36d121461c7a3bbc6ed350ecff75e1936
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to 'free Robux' and game hacks to entice users. It contains multiple embedded URLs that redirect to external sites, likely for phishing or to download further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.tw/app/431946152/how-to-get-free-robux-2021-easy-no-inspect-game-hack PDF link annotation
    • http://elib-s2.ubl.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-roblox-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/i-want-free-robux-now_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-1-000-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D3 25040 bytes
SHA-256: d5617ef3df6d093a5a0cfc7ca0067748510b3c1469aec421e2bf204ae610c1d8
font_01_sfnt_off00008bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC9 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9578 19268 bytes
SHA-256: bc013182c3707aae61a38231f54d12c151d42def38b970774330cfff4b72ae80

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