Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb4c32b6fe02a9c…

MALICIOUS

PDF

43.8 KB Created: 2021-05-13 17:52:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 140a51e9a1e8daa333157078b94f46e8 SHA-1: 921247ecc42a229886147872b583bb0621e3c25a SHA-256: cbb4c32b6fe02a9cbbd1d1365d5ebb35cec98f71e5b27099969e2cc57e5dc070
82 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a call-to-action lure impersonating Microsoft to trick users into downloading content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple suspicious URLs suggests a credential phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded URIs indicate it's designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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: https://netcdn.xyz/app/431946152/infinite-robux-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 https://netcdn.xyz/app/431946152/infinite-robux-game-hack PDF link annotation
    • https://shimony.net/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://shimony.net/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/minecraft-pc-download-free-full-version_GM479516143.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_off00004ada.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADA 26700 bytes
SHA-256: fcd609ffade80a382e5ac953e2e766bbf9c279d6db5044a9499adf6b4ef8622d
font_01_sfnt_off00008970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8970 18076 bytes
SHA-256: c10dc34708056d46d1c5f2f844ba93123ab91eb2f7cf1dd8665e6f652890d1b0

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