Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3e8817ca165554…

MALICIOUS

PDF

37.6 KB Created: 2021-05-20 14:20:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5cc15b0dcafb8a18e995e1cc3b352dc9 SHA-1: 495c0ab4f81d37d8db86da3335e403b44bfe195c SHA-256: dc3e8817ca16555491874cd88497030576fa3aac1e322402a106c09a3e7218cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirectors and known malicious infrastructure, specifically advertising "free Robux" or "game hacks" to lure victims. The ML classifier strongly flagged this PDF as malicious. The embedded links likely lead to the download of a second-stage payload, exploiting the user's trust in the document's apparent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/free-robux-without-verification-game-hack In PDF document text
    • http://simpt.stikesmitrakeluarga.ac.id/cendana/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://simpt.stikesmitrakeluarga.ac.id/cendana/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://simpt.stikesmitrakeluarga.ac.id/cendana/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://simpt.stikesmitrakeluarga.ac.id/cendana/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://simpt.stikesmitrakeluarga.ac.id/cendana/repository/free-minecraft-mods-for-ps4_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_off00003287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3287 27008 bytes
SHA-256: 98dcc239a82a5f6a65b79939a91a4812805df9d1156a7ac73eeaba4edd64b5bb
font_01_sfnt_off00006fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 18964 bytes
SHA-256: 5864977637737ef4e1bd5b7bfc66e5602b8aa3d3ed60f74fb5f96fd63c3aa8ef

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