Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7af54e0652df54b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 17:42:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7a02da4ec29b9d927a98e61119c57510 SHA-1: e7cff6e51c1cd5e7331f3558fc8e38cb06750500 SHA-256: c7af54e0652df54b58ec4c80094fbbc87837c3956ce1f6e6bdca88a320365984
142 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on `library.umla.ac.id` and point to resources related to game hacks and free in-game currency. The primary lure URL `http://netcdn.tw/app/406889139/master-coin-free-spin-daily-game-hack` suggests a scam or a redirect to a malicious site. The ML classifier strongly indicated maliciousness, and the overall structure points to a link farm designed to attract users with promises of cheats and free items, likely leading to malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/master-coin-free-spin-daily-game-hack PDF link annotation
    • http://library.umla.ac.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux-today_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_002_off00003168.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3168 22964 bytes
SHA-256: b2710d420103fc7d02ac59c7402fcddd21941c3c328c0d230cd2909abb97f49f
font_01_sfnt_off00006516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 18596 bytes
SHA-256: 115892fac058e21728dd73f14dd50efb9625691fb0bdc47d6e9343c2bb96a73b

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