Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13c8658a812e4ec…

MALICIOUS

PDF

54.3 KB Created: 2021-05-31 17:40:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 462af2ef7995356ffe0fd27b5d6287e7 SHA-1: af288abf23aabbd19aad302558ca47c0d7171003 SHA-256: d13c8658a812e4ec8c37b4ba6cba86e3e5502d0c041b5f5216349e98fea70a73
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9636

Heuristics 5

  • 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.
  • 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.xyz/app/431946152/cool-exploits-for-roblox-totaly-safe-and-free-game-hack PDF link annotation
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/roblox-hack-robux-infinitos_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/free-characters-on-roblox_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-doing-surveys_GM431946152.pdfIn PDF document text
    • http://ttikhuruthang.bt/wp-content/uploads/fsqm-files/roblox-catalog-free-headphones_GM431946152.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_off000056df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56DF 26416 bytes
SHA-256: 4cd3e40c288a2de01a95f19bc9f42417c999f66467f9572e0c2a04d2e1dd48f4
font_01_sfnt_off00009506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9506 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 18928 bytes
SHA-256: ff153218ab99ffe5ca3c02813c7218ca3c27ac75fbb4d1eeb3506e36b9c46c95

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