Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7547a825a15c7f5…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 11:23:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6265a705a6789129c24500e65115c86 SHA-1: ea607b1e41ff6539aa3cb5a39c5019a37e395ca6 SHA-256: c7547a825a15c7f59c6ebed43d2dc93619a9fb4a182f2e486ed7ed50a661ca11
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 0.9980

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: http://netcdn.co/app/431946152/how-to-get-free-robux-easy-no-survey-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 http://netcdn.co/app/431946152/how-to-get-free-robux-easy-no-survey-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/exploit-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/download-hacks-for-roblox-jump_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/can-using-free-models-on-roblox-get-you-baanned_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-bee-swarm-how-to-get-free-royal-jelly_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-2021-no-human-verification_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
font_00_sfnt_off00002f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F36 22280 bytes
SHA-256: 73da3bdcd994608be643ae64afe04e07d7b9fb47dc390d94870ad02d31f9c413
font_01_sfnt_off000060df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 19280 bytes
SHA-256: 917e415d544df6961e46a022d2994ad6ed87d429b0e561ee0f4d9ae1e69733b1