Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ed8df185f78d7…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 09:39:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61a1eed4d927fd7133090b24fb8ac3d7 SHA-1: deced2f97549d53217ff1845044c2afc463a0f98 SHA-256: b23ed8df185f78d70232943f064a00f9f62fdaa9fe5ee38dec7347ab0397fb5b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded links that impersonate brands like Microsoft and promise free in-game currency or items, a common lure for credential phishing or malware distribution. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-sites-that-work-game-hack, which is likely used to host a malicious payload or redirect to a phishing page. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/free-robux-sites-that-work-game-hack.
  • 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/431946152/free-robux-sites-that-work-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/cr7-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/bc-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/do-any-roblox-hacks-work_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rblx-city-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-things-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-hack-apk_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/apps-that-can-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-daily-spins-coin-master-2021_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
font_00_sfnt_off00003371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3371 22416 bytes
SHA-256: 5a37ce63fa975fd6515cb91f1375e5edc0b5eba399e475a565eff95ffadb37ba
font_01_sfnt_off0000658f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658F 19472 bytes
SHA-256: c870e848b7333530fcf3a181653402c0177c63a978227bac510a2a158669bcb4

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