Malicious PDF — malware analysis report

Static analysis result for SHA-256 641149fc23f5f3ce…

MALICIOUS

PDF

43.4 KB Created: 2021-06-04 00:12:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e0c767e8a12d547439600a5c2c5d9d95 SHA-1: 42eb5d061829d4338d42ff246b36ea4aa51a68ff SHA-256: 641149fc23f5f3ce7e86d94096631d8e2ee3261001d6fe5701d3c16ca5a24f8f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/2021-free-spins-coin-master-link-game-hack PDF link annotation
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-download_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/block-best-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/spin-coin_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-apk-hack-2021_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
stream_004_off00004ee8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE8 24276 bytes
SHA-256: 4c73892e8bc25c786ba9d3a0d8092eae089c423fb32f72d81742d14226f7c613
font_01_sfnt_off00008656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8656 18456 bytes
SHA-256: a76936ec484ac031b8c5f7bd82bd0b34adbabb4d9e9d5cccdc9978d26973b99a

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