Malicious PDF — malware analysis report

Static analysis result for SHA-256 01699252b06abeb4…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 07:57:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e1d899d5d287f555d370a97a50bda69b SHA-1: 04ebe7d607dfefaca0196026de9d6be84bbd36c2 SHA-256: 01699252b06abeb4ec75ad9baaf7db500f45703ee6af9ccb8c2835de3e2bcc62
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that offer game hacks and free items, designed to trick users into clicking. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://netcdn.online/app/406889139/coin-master-hack-generator-game-hack'. The document body also contains similar lures and the application 'wkhtmltopdf' suggests it may have been generated from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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-hack-generator-game-hack In PDF document text
    • http://librarysenior.com//repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/no-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-easy_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_off000051f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F1 25996 bytes
SHA-256: 40eb7074f1fc15e2ea53c2595a68b1bd1ced4d885ba9a5b9abd1b4f3c0d42b11
font_01_sfnt_off00008d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D71 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off00009854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9854 17716 bytes
SHA-256: b5038ced4ab316a7f74842444eb7c28ee9c11b1798bcdca0ea22787b41e5f9ea