Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda7e63b704c392b…

MALICIOUS

PDF

37.3 KB Created: 2021-05-24 04:48:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2de525a4f4dfe3afd74c9bf10e34d92 SHA-1: ef27c5f3ac0eba224d2af9b57e83e1b3587f0644 SHA-256: dda7e63b704c392be001ee7b84807e772b611e942a53186f180af08aebbcb5b7
160 Risk Score

Malware Insights

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

The PDF contains multiple links and text elements that lure the user into clicking on a 'Roblox Password Hacker' or 'generator' which redirects to malicious infrastructure. The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-password-hacker-game-hack, which is associated with known malicious redirector infrastructure. The document body also contains numerous other links to potentially malicious PDF files hosted on kldcardio.ru, suggesting a chain of malicious redirects or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/roblox-password-hacker-game-hack In PDF document text
    • https://kldcardio.ru/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-free-item-codes_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_002_off00002f52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F52 29100 bytes
SHA-256: 0ec06b2d7531bcef41b692d7ff2f570c2d988779b66c7e7a8364d607dd321fcc
font_01_sfnt_off00006f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F46 18672 bytes
SHA-256: 2bdb07dac700063222d9705cc7006270fda87721bb9ffc7ab205fe7d4072a16f

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