Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88e7a64214c6793…

MALICIOUS

PDF

45.1 KB Created: 2021-05-15 05:32:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 77ffc857fd01e7e4c7a53f9448448d18 SHA-1: 108b9f05b02b734e1cf08d8e3268b7cb0d3793b4 SHA-256: c88e7a64214c679338e5a6a8e142bd92fc36a5bb459a6272180ccbc1b51b0b39
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 0.9621

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.xyz/app/406889139/oginject-co-game-hack PDF link annotation
    • https://sensorcamera-tw.com/upload/files/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-roblox-website_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_003_off000048ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AD 25508 bytes
SHA-256: 7bfef0db130814b92c9ba9160e7945b23038edcc9d9cbc8971c8e733cbfcad8e
font_01_sfnt_off000083e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 3460 bytes
SHA-256: 27f6ee24b80a0c45a340e32027a43d6c3a7853aac96563eed14d58819399f6a8
font_02_sfnt_off00008f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4D 17796 bytes
SHA-256: edfc933cef9a2285abe675eee9fa95d4e262eddbac9f1810b55b91553a16c6ad

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