Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37f35f6e24d528c…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 14:53:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4069090087fd50ee2648d1506fc6d3c9 SHA-1: 8a1094aad1d5f2b22c3853d0aee6bf0007759c89 SHA-256: b37f35f6e24d528c499fff5e960b42712bae7d4181d8b03e4edc8e89ec5e8372
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a game hack, specifically for Coin Master, and directs users to external URLs. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to solicit sensitive information like private keys or saved passwords, which is a common tactic for credential harvesting or scamming. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-hack-online-android-game-hack PDF link annotation
    • https://bancroftandsons.com/images/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/robux-offers_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/robux-sites_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://bancroftandsons.com/images/no-scam-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_off00004d76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D76 23872 bytes
SHA-256: 5e6218553d5c18fcad4527add3086b76a1608b31c7c8aeb18f0ca4de907f8c30
font_01_sfnt_off000083c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C7 17964 bytes
SHA-256: e085c742a6298e55fcde9a217167edad0f2b0c01ff8e5715ed5b8bb288dc9136

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