Malicious PDF — malware analysis report

Static analysis result for SHA-256 66065c3e4ecc584b…

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 07:36:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ea79b718f5821f51dde5ceda5bf6bc5 SHA-1: b544ca3c00e09ac432223981c5e5f7fd4438c578 SHA-256: 66065c3e4ecc584b4b18ccc3ef29d8a2e42ba824a3644b8d216f431b96c07952
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, disguised as game hacks and free item generators. The document body and heuristics indicate a lure for users to click these links, likely to download further malware or be redirected to phishing sites. No scripts were extracted, but the presence of malicious links and the ML classifier strongly suggest a malicious intent.

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.co/app/431946152/roblox-free-dominus-download-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/list-of-roblox-hackers_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/xonnek-roblox-jailbreak-hacks_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-bee-swarm-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-unlimited-robux-glitch_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-gift_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-isername-change-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/without-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-in-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/10-roblox-gift-card-free_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_off00003109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3109 22692 bytes
SHA-256: 48641c4afba08d18d74f26f3893770c168a70924b20b67922d994b62d8cb1ccd
font_01_sfnt_off000063aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AA 19676 bytes
SHA-256: 54e1faf482a3a467822c795e5f66c4cbb8ccd6feefad5a9317491a0278bceb11

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