Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53e83e3f23fb411…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 22:03:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4df254158a13ca11355711123110da6a SHA-1: 42e85e1044616980da34e82c75aef3e8203b0e85 SHA-256: c53e83e3f23fb411bb4b939f8006b2d8fac8ae25df7e3d7b3a52ba499716885f
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 0.9865

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.online/app/431946152/rbx-gg-free-robux-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.online/app/431946152/rbx-gg-free-robux-game-hack PDF link annotation
    • https://www.bridalguide.com/sites/default/files/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDC 26568 bytes
SHA-256: 9194b2acd2220dd31146a5515163eda6588e42ccf93445829e9d1aee829f4d1a
font_01_sfnt_off00008b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5E 18304 bytes
SHA-256: d1ad45f5b083d36c6ec4c124be04f92537ae8dd31535970cb7662339535ad89d

Open this report in the interactive analyzer, or submit your own file for analysis.