Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f87701c4b2a3039…

MALICIOUS

PDF

45.8 KB Created: 2021-06-10 22:17:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1032f4596534bffa6a1bc5d402bed8c SHA-1: d793219b61852873d5e30265af529fca40b8562e SHA-256: 0f87701c4b2a3039692bd27fc672e56f2fb9aec4c5ceefe543257551e70b6cb2
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into downloading a file from an external URL. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the embedded URL suggests a download attempt, likely leading to further execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/descargar-roblox-para-pc-free-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/rbx-earn_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-free-micky-mouse-clothes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/tiktok-free-6-months_GM835599320.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/pokemon-go-free-qr-codes-2021_GM1094591345.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-exe_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_off00005380.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5380 26068 bytes
SHA-256: edf1b03ebc6569ceaded88231703362bfaf36e7ca62adbf0c0bf6de4d04fbc18
font_01_sfnt_off00008f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F17 18784 bytes
SHA-256: 1527da3bdc294bfbd38dbce474d9188ea2a49565df43a42ae30f0d4b634ee7d3

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