Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c23d34240e513f…

MALICIOUS

PDF

47.6 KB Created: 2021-06-11 01:33:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 340f9d0813bd879cce92b97793637d4f SHA-1: 49adcc6c7038e0445a8abef18d7c909e8588d9b8 SHA-256: 31c23d34240e513f43f376f0f4e8a9d64da04eeb37cdde85e8648217f2c96c99
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.tw/app/431946152/free-robux-2021-november-game-hack PDF link annotation
    • https://library.sman1berau.sch.id/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-100-works_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-obc-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-spin_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-hack-us_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_off00004f35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F35 26072 bytes
SHA-256: c9358760f002e427d8e694b2e6a5a4f034b2bdf53f9a44aedba405e49f7ae95a
font_01_sfnt_off00008bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFD 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000095ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95AE 18792 bytes
SHA-256: 26f4057eb9d6867c8cfcf5f9284f9ee8af393eef569eb2e2d86e0b5ecdcb4dda

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