Malicious PDF — malware analysis report

Static analysis result for SHA-256 f852f42cffc6daa5…

MALICIOUS

PDF

30.6 KB Created: 2021-07-19 00:56:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca82860539902e53a40f30c2460cb2ad SHA-1: 2eb968b6fd0c2c64ee3d05f5b37f5b5a1edc7a75 SHA-256: f852f42cffc6daa58f68e43210f9f2f4450540ccd2d82f142b2cfae2f6dc391b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or 'game hacks' to entice users. The document body also contains a call-to-action phrase, 'CLICK HERE TO ACCESS ROBUX GENERATOR', further reinforcing the lure. These links likely lead to a second-stage payload or phishing page, indicating a malicious intent to exploit user interest in free in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9319

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/can-u-get-free-robux-game-hack In PDF document text
    • http://www.das-kinderzimmer.net/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://www.das-kinderzimmer.net/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.das-kinderzimmer.net/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://www.das-kinderzimmer.net/images/how-to-get-minecraft-windows-10-for-free_GM479516143.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
font_00_sfnt_off000023ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AD 22204 bytes
SHA-256: 5858730102eafe2dad9bea3a706072d7951bc36fb2a82a3322198a10f990e41f
font_01_sfnt_off000054d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54D7 18532 bytes
SHA-256: 35bb0f01f69d1b5e790ed5f4c0eeb98998139975dc1eb58b588dc01b9002bbc1

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