Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8b5a09648ce208…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 08:16:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3038c44c3ca088232c8afc4036cbe16c SHA-1: c98696bc85d5cf9d1727ca9c2bbb48ff26ebf684 SHA-256: 2e8b5a09648ce208b809b9a682d69bec2a92a49460284740faff42ddba9c1fa3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery 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

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/coin-master-free-spins-2021-today-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-today-codes_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pokemon-go-free-qr-code_GM1094591345.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/tiktok-free-online-download_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/blox-land-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_004_off00004e0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0E 25120 bytes
SHA-256: bfc8fa5fa5385121b511f6257ab6337f5c10cf08831e8715bd66edfd3c99bb9d
font_01_sfnt_off00008767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 18644 bytes
SHA-256: d7949929735619194fc75e12c0f3ae3f795649f1857edc5f48659c3a35b254e1

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