Malicious PDF — malware analysis report

Static analysis result for SHA-256 33823d59dfb62acd…

MALICIOUS

PDF

44.7 KB Created: 2021-06-07 03:48:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4349e01fffc54555b715f8ca9eeb7382 SHA-1: 37916d6b0432876162b4ef4c9cb6b58d47b7e38d SHA-256: 33823d59dfb62acd6e63a5b711f4bb12733ed9703062a4215a21700609f5b407
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, with a primary link redirecting to a "free generator / game hack" lure. The ML classifier and specific PDF heuristics strongly indicate malicious intent, likely to drive users to a phishing or scam website. While no scripts were directly extracted, the embedded links and the nature of the lure suggest an attempt to exploit user interest in free in-game currency or hacks, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/888-robux-free-game-hack In PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-black-roblox-music_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-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
stream_004_off00005155.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5155 25332 bytes
SHA-256: d9bf05ecbfd1a521387705dbec4ffbefc4b81754db9a3afb9b244159bd9342cd
font_01_sfnt_off00008c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C50 18224 bytes
SHA-256: de80481fa36be7efbd5ccce2fb806a0135c10b3807d5945a17e37e36518f92ab

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