Malicious PDF — malware analysis report

Static analysis result for SHA-256 363ef491c5d12052…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 13:03:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6c79f0a96b8de3a622f95ec46535dee2 SHA-1: 2dda19e29bcda5881b4a8cf656aa7eddd03d101b SHA-256: 363ef491c5d12052fc425840b29d6289f80f010ef556ef42aae459a543b6d12e
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as a "free generator / game hack" lure. The primary URL, http://netcdn.tw/app/479516143/how-to-get-minecraft-windows-10-for-free-game-hack, is likely used to deliver a second-stage payload or redirect to a phishing site. The ML classifier also strongly indicated maliciousness.

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/479516143/how-to-get-minecraft-windows-10-for-free-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-a-roblox-account-that-had-no-email_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-anything-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-robux-hack-february-2021-pastebin_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/cheat-engine-roblox-hack-download-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-bc-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-pet-roblox-grow-a-candy-cane_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-without-installing-apps_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_off00003257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3257 21864 bytes
SHA-256: f546f412dc409b1b99a7cbf005913e3e4adf23de2742c866739ff1c66b9d480e
font_01_sfnt_off00006240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6240 18812 bytes
SHA-256: 78af6c1a79895a4d6094e0f9df7a7bf166215c31d8c8ac3ce0b9542e24fb5cba

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