Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b193cec85346e2…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 07:14:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0bbbb1ac221def2e0bc72715e8f60deb SHA-1: aa0611dcfa1c1756cd13208cc5f90a95d44ca81d SHA-256: a7b193cec85346e2969f2b21337372fcae810392a01fa9eef65563f183b8b711
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/835599320/is-tiktok-free-on-iphone-game-hack PDF link annotation
    • http://pustaka.minangkabau.unand.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/mobile4free24-free-robux_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_off0000527f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527F 24312 bytes
SHA-256: 1d0341b50801343d774c459a86ae8d7dcf6fb8f3179b98ecd6aeb1238ed90f81
font_01_sfnt_off00008a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5C 17796 bytes
SHA-256: 12273cf5ff66d6a00b456607523e095aaeb1a02d8110cb403ff190aadbe7628b

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