Malicious PDF — malware analysis report

Static analysis result for SHA-256 533f0efb09056760…

MALICIOUS

PDF

38.3 KB Created: 2021-05-21 04:38:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cd077e39ef656f8c0e9ab8651c0c3148 SHA-1: d189616aeab007807ce1e609261f9a10474bd4db SHA-256: 533f0efb090567602fbbdf2a78856b981886d5ee087cfdb0f6578dd9eff5565c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/code-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow designed to lead users to potentially harmful content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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.xyz/app/431946152/code-free-robux-game-hack In PDF document text
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-foxy-food-coin-master_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
stream_002_off0000357a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x357A 27400 bytes
SHA-256: 72bdc7bae943d3272988c21e37f57d6ef91e0c0fe8007912b03a7e50d5f57d56
font_01_sfnt_off000074e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E0 18188 bytes
SHA-256: 00280273b0975bee0187bf1a1cc0e29ac13cf800f2976c84d5f4ba53341fee41

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