Malicious PDF — malware analysis report

Static analysis result for SHA-256 531381c2fcec05d6…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 05:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 12f30d25d723b361d8fdfbce96c33f84 SHA-1: a4c820a90f17140548e417fa01d0c7426fda5823 SHA-256: 531381c2fcec05d6d90aea7e4c07892048c25d33b2d7efead2e6259b1dc41c97
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of game hacks and free currency to entice users. It contains numerous embedded URLs that point to link farms, suggesting an attempt to redirect users to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI links and a download button lure further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/431946152/robux-earning-websites-game-hack PDF link annotation
    • http://stmb-multismart.ac.id/perpustakaan/repository/hack-catalog-roblox-mod-menu_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-hack-a-roblox-account-2021-easy_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-roblox-account-generator-2021_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-robux-2021-19-pastebin_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/roblox-cheat-engine-scripts-2021_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/roblox-how-to-get-free-robux-without-hacks_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-hack-roblox-2021-june_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/download-hack-tool-for-roblox_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-use-pabestin-codes-hack-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/hccb-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-hack-coin-master-game-ios_GM406889139.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_off0000318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318E 22004 bytes
SHA-256: 853de76d0e791a874a58fbce119ebb4ced09522bd006bcb12e0ee25f8ad3f33a
font_01_sfnt_off00006271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 18976 bytes
SHA-256: c40708dd9bc9f9da8d82c70e8c8e3b96b80ee502ff2c69e470291093ca3e5ce3

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