Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2243e3fab8fd675…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 17:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 984b3d0740a02020eaecc0c6c497f500 SHA-1: c28e79eb1dbfd6cbe10329a7f5f85dbdf90c4b69 SHA-256: f2243e3fab8fd675fa0eac0560a9fbc31cbd6d55ac43bdad4fce2ea1e73d9aaf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The primary lure URL is https://netcdn.xyz/app/431946152/free-robux-link-game-hack, which is flagged as a malicious redirector. The document body, though partially corrupted, contains references to this URL and other similar-looking PDF files hosted on mbbs.hr, suggesting a phishing or scam campaign. No scripts were extracted, but the presence of malicious links and the lure content strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/431946152/free-robux-link-game-hack In PDF document text
    • https://mbbs.hr/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/app-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-exploits_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_off00004991.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4991 26028 bytes
SHA-256: 5faeb20a0f5a6ece73ea44b10306ea82ab231c92a4a1e271594c1a30dfb2cca5
font_01_sfnt_off00008633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 18304 bytes
SHA-256: a4aae99c46e0a0f586669c3aecb8c0d6e5f23962dc49b2f1654f133382ac5317

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