Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f932bb32d95956…

MALICIOUS

PDF

45.7 KB Created: 2021-05-15 12:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0236e21239ee2a50a8ee3b961e2f47e2 SHA-1: 0b1e05f938f44269c31e828501b6dc223752aa02 SHA-256: 21f932bb32d95956938db50a75874cdea5c404916a2d5bdfbaea8076c351013f
142 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as a link farm for SEO purposes, pointing to documents related to game hacks and free in-game currency. The primary external URI, https://netcdn.xyz/app/431946152/rbx-com-game-hack, is associated with a brand impersonation lure for Microsoft, suggesting a credential phishing attempt or a download of a malicious payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/rbx-com-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/rbx-com-game-hack PDF link annotation
    • http://miriammcconnonart.com/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://miriammcconnonart.com/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://miriammcconnonart.com/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://miriammcconnonart.com/images/coin-master-free-spin-links-december-30-2021_GM406889139.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
font_00_sfnt_off00004901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4901 25768 bytes
SHA-256: 6d2a0f9f80cc355b2b2a818278fa27d960a0e77b156503e9889f1d02f8df6307
font_01_sfnt_off000083d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000090e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E3 17972 bytes
SHA-256: dffe5730268319e8d6523eb3a7b4d2737e6b1bc7523d2c18f722e59dff9dcb58

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