Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4c9908a531be6c…

MALICIOUS

PDF

49.8 KB Created: 2021-06-03 12:57:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f7b3be2816028e6f23664cca1de29ffa SHA-1: 1fb5a1e4a96e0451d00198bd3a3d66a03a510060 SHA-256: 3f4c9908a531be6cef38b73519055fa71d26a3677ba8e7810268d4b5133dd16d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links designed to redirect users to malicious websites, masquerading as generators for game currency or hacks. The document leverages a link farm strategy, embedding a large number of URLs that point to potentially harmful content. The primary malicious URL identified is https://netcdn.online/app/406889139/instagram-coin-master-free-spins-game-hack, which is part of a known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/406889139/instagram-coin-master-free-spins-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D3 31204 bytes
SHA-256: 9a0d134e7618c717b72e7e8b823532fe7a79e2ab99b0aaa57c687af9f403c65a
font_01_sfnt_off0000955a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x955A 2944 bytes
SHA-256: a0301b7f2c576e4a889a11eed4f4f7770c47239120b218cd3fd1d2cb36c2aaf5
font_02_sfnt_off00009f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F82 18432 bytes
SHA-256: 2b49b18ea8e6af85f9d01b8086051709ac83a6aa6280f9f1047115a4054a4512

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