Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b532da7876f1dd…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 11:02:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3acd7c97066f1845835d8177f6f04d5f SHA-1: 24d462039fec93554e163b2b3dcc72b44f1db43b SHA-256: c4b532da7876f1dd97a97045dbf7a0afc62663a64f4eec449e4a0890a75963fa
142 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it links to a game hack lure, specifically pointing to a URL that appears to be a generator. The document body also contains the same URL, reinforcing the lure. This suggests the primary purpose is to trick the user into visiting a malicious site, likely to download further malware. The presence of PDF-specific heuristics and the ML classifier further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/tiktok-minecraft-hacks-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/tiktok-free-hulu-account_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-peoples-roblox-accounts_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_off000052c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C1 26372 bytes
SHA-256: 916964e65b12882419aae6d90633bcb502c100facd0f8f63737e3d0dacefd4ad
font_01_sfnt_off00008f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F25 17880 bytes
SHA-256: df7e49ec95a548ee0d23b7b279df4e27423bf5bf6641f50b7ca94314a26af21a

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