Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd2818bf5d2db23…

MALICIOUS

PDF

31.6 KB Created: 2021-06-03 05:58:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 655467d42cfe2a68476b5a5d00a07ef0 SHA-1: 0db9cbaaf7791bb3a5867b93b51133f33ef4e2ff SHA-256: fcd2818bf5d2db23662c0f4e45bac4e2b2711fc6c265aba96302759f826e1a76
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'Robux Generator' which redirects to a malicious URL. This URL is associated with known malicious redirector infrastructure and is designed to trick users into downloading a payload. The document body and heuristics indicate a social engineering tactic to entice users to click the link, likely leading to further malware infection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0621

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.online/app/431946152/robux-generator-no-human-verification-2021-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
stream_002_off00001d9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D9D 25608 bytes
SHA-256: 9b4ff6774f26b57c91ce22379178b72b3c7cf851e9eac133bb160fb4a25ea3bd
font_01_sfnt_off0000587b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x587B 18792 bytes
SHA-256: 4751aef16b2335caab672ff38cd1932cd5a8b0237653eaf7e6dddf99d14b7421

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