Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4da914caf9c4ff8…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 07:52:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7548d90b3ce3559b296acd0126839be1 SHA-1: 89b01e73d14eb268003e60f16b9f8aedad5d4cb8 SHA-256: c4da914caf9c4ff8108142adec7d4d5a6e8d81ed3316fcc611e4859ce2c05d8e
122 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 brand-impersonation credential phishing. 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 0.9971

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/free-spins-coin-master-no-human-verification-game-hack.
  • 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/free-spins-coin-master-no-human-verification-game-hack PDF link annotation
    • http://ig-tauchen.de/images/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://ig-tauchen.de/images/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://ig-tauchen.de/images/generator-robux_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://ig-tauchen.de/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://ig-tauchen.de/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ig-tauchen.de/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ig-tauchen.de/images/how-to-get-free-robux-without-doing-anything-2021_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_off00004a2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2A 24752 bytes
SHA-256: 319eededeaa64cbdf483ccb01155736c337d05f6c78f33307c8c4c14e07d3e41
font_01_sfnt_off000081fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FA 18420 bytes
SHA-256: 17135a8ac8f0ddf9b092d45ccb6416efee18f7ec3206ddf644b79c382a5218c8

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