Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e9ec662c55e929…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 12:24:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6eefcae4c8e09e432557ad04c4670085 SHA-1: fe99bafed79ac3b4f89f31f43781834f432f464a SHA-256: a7e9ec662c55e92936f6447dcdde560bb45f5f82b1e8f69c550ad7e9cc4ad417
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The primary lure appears to be related to game hacks and free currency for games like Coin Master and Roblox. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly suggests these links are intended to redirect users to malicious content or download further payloads. No scripts were extracted, but the extensive link farm and lure content indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-spins-on-coin-master-2021-game-hack PDF link annotation
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.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_off0000521f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521F 25076 bytes
SHA-256: 8f865982431de5ecfcd1ad0d3ebde617ac8d27569d1c76d70f5fb9520aa21daf
font_01_sfnt_off00008b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6C 18288 bytes
SHA-256: e7fc04cebd192de8ea685c8f65a9790caba4d729d1f53b0455241ee170bde56f

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