Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff8bdf89f48a892…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 04:06:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: eab9b55bd0dd0658472b6d333f93eba2 SHA-1: 4e26331334c649ef272309995fee62253378ed6a SHA-256: eff8bdf89f48a892d0b7f6c60fe7b0d02992c751994bcee6ff7bb68149c11f7a
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with embedded links. The primary link, 'https://netcdn.xyz/app/479516143/free-minecraft-skin-packs-game-hack', is presented as a game hack, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites, potentially for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/free-minecraft-skin-packs-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/instantrobux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/bit-ly-coin-master-hack_GM406889139.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_003_off00004cf6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF6 25176 bytes
SHA-256: 0dc86d012d6ea7c234edc87c983e06ccf2296760044ec72daebc2eda48af197a
font_01_sfnt_off0000854d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x854D 17892 bytes
SHA-256: 3d88f62d7f103248f07683485ae665a8ae7a7912bf87b287aa517b4ed8ad8cc7

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