Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afeb90f58edb76b…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 07:58:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7913f94742419f31c3cdadbd74bc79e2 SHA-1: 53a54d49835a2a83fb671b05ab0fc9a032f09990 SHA-256: 3afeb90f58edb76b1079d70e76f0093368aa25af34facb023b26b156b6823a66
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 0.9980

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 http://netcdn.tw/app/406889139/clean-master-free-coins-and-spins-game-hack PDF link annotation
    • https://library.sman1berau.sch.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/without-pokemon-go-free-promo-codes_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/identity-fraud-roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/when-does-roblox-librity-county-come-out-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-promo-codes-not-expired_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/granny-roblox-free-money_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-download_GM431946152.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
stream_002_off00003139.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3139 22424 bytes
SHA-256: c71749ad9204dcf95d4a337155c5d80c5d82daef874f458ea6aa41f96b04fa08
font_01_sfnt_off00006324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 18424 bytes
SHA-256: 422edec60c9a60eea153bffbb034d541e181a6e8f3b8dab89cf23806ccd959ba

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