Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45cd61942a9980f…

MALICIOUS

PDF

29.6 KB Created: 2021-07-20 14:51:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d677042b04cf8ac7165b64471e06a17d SHA-1: 1f59a33c16a535fa27c2493a0e06a4d8e8eaf22c SHA-256: f45cd61942a9980fc9c4d08a18f85b620360a23a054316c6b34f9db6edffecdc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'free Robux' generator or 'game hack'. The document body and embedded links strongly suggest a social engineering lure to trick users into downloading further malware. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious redirector is being used to deliver a payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0794

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-no-verify-game-hack In PDF document text
    • https://eeinfantilcarinhadeanjo.com.br/wp-content/uploads/fsqm-files/minecraft-pe-free-download_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_off0000225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225C 21228 bytes
SHA-256: e023aa3dddb16446e81dc57e85752102d2979c23a3fa40ea2269d7449e3021a0
font_01_sfnt_off000050f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50F6 18632 bytes
SHA-256: ab568fed1de22e4f9e44d61f81238b6869891b9e72775c0eef2883527e5d17e8

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