Malicious PDF — malware analysis report

Static analysis result for SHA-256 405accb0170c8d3a…

MALICIOUS

PDF

51.0 KB Created: 2021-06-09 01:58:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 54d0a62aa40ba0f1d555f50995ba7f8d SHA-1: ad11dc3f88326a63505fbd4881df428bb63d158c SHA-256: 405accb0170c8d3a31582aae284a1352996ac4476ec780814081dc30d07bde8d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing for a 'game hack' redirect lure, pointing to a suspicious URL. The document body, though heavily obfuscated, contains references to 'Roblox' and 'game hack', reinforcing the lure. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirect URL which likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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/free-free-roblox-games-game-hack PDF link annotation
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-generator-download-no-surveys_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-how-to-create-a-group-for-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/www-roblox-com-robux-free_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_off00005027.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5027 33524 bytes
SHA-256: 97154c4cd9cc42908e3d431dddc50dcb74a4ec79c91cb4fe311606ffa4d579de
font_01_sfnt_off00009a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A90 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000a43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA43F 18436 bytes
SHA-256: 1154999e82da0747c776d7c9f34d1d0f1f999c0809ddede61ee55510fb477842

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