Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfbc43ba2ac6e20…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 05:59:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6e1d93ee7bf8ec943fcdb328af3e6495 SHA-1: c6810ad5d654bf623e7facd121d3104e90916854 SHA-256: ebfbc43ba2ac6e206e8edb32fc205d7198fe711b9e0991066222a71a39dbe291
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors disguised as "free generator / game hack" lures, impersonating the PayPal brand. One primary URL, https://netcdn.online/app/431946152/tryrbx-site-free-robux-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to similar lures and embedded URLs, suggesting an attempt to trick users into visiting malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/tryrbx-site-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
  • 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/tryrbx-site-free-robux-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pokemon-go-free-download-hack_GM1094591345.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-svg_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_off000050fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FC 24436 bytes
SHA-256: dc10234ed8d98af4e7bd10fa27faa241d67dd8799ca82b9b2439263db33b2afb
font_01_sfnt_off00008944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 18420 bytes
SHA-256: c05555d4ecf6fda64d59e10aa7bbdccb6b0b8342b7e9a04540fdd3a1ca0e8435

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