Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e341988f714cac1…

MALICIOUS

PDF

42.1 KB Created: 2021-05-19 02:08:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cab18ffc9e016c9fb04b954c3bf6a05b SHA-1: dbbb350868faa320e5c0a168100328fc1c048a83 SHA-256: 8e341988f714cac1588d5e9eff866fc14fc91b09d454499e7b02e69d34ea9fb0
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 0.9971

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.xyz/app/406889139/how-to-get-free-food-on-coin-master-game-hack PDF link annotation
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/hack-client_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/lazyblox-com-free-robux_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_003_off0000490e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490E 25788 bytes
SHA-256: c5f8fb4ba8a9658d567833d74c6ff634aa5d94756f0b1e81245fa678acc013d0
font_01_sfnt_off000082d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 18048 bytes
SHA-256: 80f71b64fdae1376f671ee29083f27768c0f143acc59e91e746c89af89705883

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