Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df6544cf2d59d4…

MALICIOUS

PDF

38.0 KB Created: 2021-05-24 16:17:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e24bf972f0cc2137fe81d67cb65e48da SHA-1: 7358bdefbdac343f1fa10d86eeba3705503d2529 SHA-256: 85df6544cf2d59d462fd75d15f52fa33ac30216b738b0eb8d6c2e5c4a614b03f
160 Risk Score

Malware Insights

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

The PDF contains multiple links and a prominent call-to-action related to game hacking, specifically Roblox. The primary link redirects to known malicious infrastructure. The document body and heuristics indicate a lure designed to trick users into clicking malicious links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/how-to-hack-roblox-accounts-game-hack In PDF document text
    • http://zercalo.org/images/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-no-human-verification-2021_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_off00003345.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3345 27432 bytes
SHA-256: 367f433716c0b35c667642d06d99fa1be17aeffa4000aeeaee9c935706600cdb
font_01_sfnt_off00007215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7215 18588 bytes
SHA-256: 7bfa318362f39458d7d6cfaed4b7fb6212c616d22e88bbb7e9e73b07c323fe95

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