Malicious PDF — malware analysis report

Static analysis result for SHA-256 677a529fe4c0cf0b…

MALICIOUS

PDF

34.0 KB Created: 2021-07-19 09:41:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 44784d9bd7978dafb08fbb69abd47014 SHA-1: 4b628fa87ca4240b77a04138e7d990f40ece44a8 SHA-256: 677a529fe4c0cf0bc8413c5706ed8a58f07ea22dbd13739199763b0f2e14f223
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising a 'free generator / game hack' for Minecraft. The document body and embedded links strongly suggest a social engineering lure to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7230

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/479516143/try-minecraft-free-game-hack In PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273B 22932 bytes
SHA-256: 9191184a3265bc39aae5ebea01ff1c6cc3c6899030d6dc2dd2ab63782d949443
font_01_sfnt_off00005a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 17748 bytes
SHA-256: 107932d4c819bf12e68df3d86f91d46cdcad91a8442b853cf72bc94cc41b7ea1

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