Malicious PDF — malware analysis report

Static analysis result for SHA-256 2387c5ef9f9a5c07…

MALICIOUS

PDF

35.7 KB Created: 2021-07-07 16:20:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e6e6af4e435214a0d2f65c4037637bf2 SHA-1: 59b7e963e3f28b1309c670dc8394f6e58ab566a6 SHA-256: 2387c5ef9f9a5c07fb7bc23b7a985e4705d104e9d3a0920bc0e7548ee21af78e
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free Robux' generator or game hack. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring the user to click these links, which likely leads to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-no-verification-or-survey-game-hack In PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/link-for-free-robux_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/hacks-for-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku//repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-game-hacks-2021_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-cheat-codes-for-money-on-jail-tycoon_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/free-items-for-google-play-roblox_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku//repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/free-robux-no-survey-mobile_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/youtube-roblox-how-to-get-a-free-dominus_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-noclip-hack-no-cheat-engine_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-hack-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/noclip-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/ban-script-hack-roblox_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/free-robux-for-pressing-the-button_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/crap-my-roblox-account-just-got-hacked_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-roblox-hack-free-robux-generator-uirbx-club_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/hack-de-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/robux-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/how-to-make-a-free-robux-hack_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_off0000334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x334F 22508 bytes
SHA-256: 8006b3e56934fe7b811497178b8fcd763f3b455024f1ce0f822348cf2e6aff6a
font_01_sfnt_off000065ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AE 19368 bytes
SHA-256: 551afc8435a3263a9a14f68c6fac56cdd03dabd4713ff120a4b3cc718d9f39ef

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