Malicious PDF — malware analysis report

Static analysis result for SHA-256 253412d2a6903774…

MALICIOUS

PDF

31.1 KB Created: 2021-07-19 06:55:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6f0081bb60bc015934b2a22eb82f5349 SHA-1: 3fd68a81628a487a2e9bbf481f43e908f1741378 SHA-256: 253412d2a69037740cb831acac8d3b37928fe4f990f61795aadb236ec8a4d2a7
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a "free Robux generator" and embeds a link to known malicious redirector infrastructure. The document body text, though partially obfuscated, contains phrases like 'Free Robux Legit' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the phishing pretext. The embedded URL is the primary indicator of malicious intent, likely leading to a further stage of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0564

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 http://netcdn.tw/app/431946152/free-robux-legit-game-hack In 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
font_00_sfnt_off000023c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C4 22668 bytes
SHA-256: fde931da6f9342aafbf192e6767488253ed7024164018bc46337efe734cf5a2a
font_01_sfnt_off000056ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AE 18712 bytes
SHA-256: 0a3bb92d146b122749d57d36755b29a560cd1c032c54bb08c637f56f67b3a8e8

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