Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe4852e30f46872…

MALICIOUS

PDF

31.1 KB Created: 2021-07-20 15:53:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e596dac54e7e7fe1103187290d1c33c3 SHA-1: 7fc17aba47e630b5e7e65933dc93ee4d5ac0031e SHA-256: 6fe4852e30f468726246f0c4ce34d65d4204b2e6d45408fd096db8a9367863d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to redirectors that promise free in-game currency, a common lure for phishing or malware distribution. The heuristic firings indicate the document is designed to redirect users to malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free items to compromise their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9375

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/how-to-get-free-robux-with-no-verification-game-hack In PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-spin-coin-master-2021-link_GM406889139.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_off000021a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A5 22792 bytes
SHA-256: 63a112585d25c9a68b638821fb279ebf52717a67ea038a7860037b541d9e0698
font_01_sfnt_off0000549c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x549C 19312 bytes
SHA-256: 1dcd8f472644bbfbea9938e32028314b4c3da663e3cbf8c509e8fe1bea5d503c

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