Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21cd43e976ca3f1…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 12:43:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3a2585d8b645ca34a8314c69d5a032d7 SHA-1: 51a0c414555e549e22a9522cf36fe00812dbed99 SHA-256: c21cd43e976ca3f18bebc8dd1b9f08c290f85a4e92cfc90a6f576da3746a7e9b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9748

Heuristics 4

  • 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/how-to-get-free-spins-on-coin-master-game-game-hack PDF link annotation
    • http://library.apsidoarjo.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/youtube-roblox-broken-bones-cheat_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-free-version_GM479516143.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_off00005191.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5191 24540 bytes
SHA-256: 8fadf1cfd0f8dc9732d0f9b70029920fb29579f440d55837b2ea6b2ccad78e42
font_01_sfnt_off000088dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DC 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off0000927a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927A 18308 bytes
SHA-256: 10163bb99b7c52850725d3517fa904ee973029f2387d51d5c8df1a27f3218e6c

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