Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c029d24af5d0bab…

MALICIOUS

PDF

32.6 KB Created: 2021-07-24 06:51:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b4fa78b04ed41a77be7a48fd4fa9b728 SHA-1: 5bcdcc6e2cacc65c2beaa63e3935f4ab044e0135 SHA-256: 8c029d24af5d0babb93af12bf58f570415915bca0e78d5058fca8501819017c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' to entice users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/how-to-host-a-minecraft-server-for-free-game-hack In PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ft.unismabekasi.ac.id/katalog-buku/repository/free-robux-card-codes_GM431946152.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_off00002d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D40 22216 bytes
SHA-256: a748b188fb8deba6aca52fe789428b825d2896856244261f4d9373e130d8eef2
font_01_sfnt_off00005e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4E 17988 bytes
SHA-256: 552c8aaf5f0bf5f0c44469b5bd19d93c548c2f36967da1a6f1157fed71bc8ec1

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