Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9b6755dd4d3f63…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 10:56:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a5350162bd48a53d850b8780838714f0 SHA-1: 06c05283da87a4926714a358561a24bffe7d59e2 SHA-256: bb9b6755dd4d3f6374352c86edf55d5d2da52398298980046d7aa4220525aa74
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/free-robux-2021-game-hack PDF link annotation
    • http://www.library.smactf.sch.id/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-hack-someone-on-roblox_GM431946152.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_off0000514f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x514F 24244 bytes
SHA-256: 962b908342025e856bc38ea61bd8361d94e4dd97961168562e4bc3093d3752b7
font_01_sfnt_off0000889c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889C 3608 bytes
SHA-256: 38b270e1156baf55f52eefd6c0272d25f41d6b4ef7b6a9aa3301989c4dacee27
font_02_sfnt_off00009524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9524 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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