Malicious PDF — malware analysis report

Static analysis result for SHA-256 689fe194dfa11a2f…

MALICIOUS

PDF

40.0 KB Created: 2021-05-01 11:21:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f6baec9a3b7c761fb0ce8d049172f39c SHA-1: b7a77d3c1128fffd0887df88ca4f311bfe8a3690 SHA-256: 689fe194dfa11a2fb512c1eb0d3f28feb30c85102f02b40427a1aaf6f176e9b4
82 Risk Score

Malware Insights

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

The sample is a PDF that impersonates PayPal and uses a lure related to hacking Roblox accounts to trick users into clicking a malicious link. The ML classifier strongly indicated maliciousness, and the presence of external URIs and brand impersonation heuristics support a credential phishing or malware delivery attack pattern. No scripts were extracted from this sample, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/how-to-hack-a-roblox-server-2021-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/how-to-hack-a-roblox-server-2021-game-hack PDF link annotation
    • https://library.sttbandung.ac.id/repository/que-hacer-cuando-te-hackean-la-cuenta-de-roblox.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/learn-to-hack-roblox-for-robux.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-rixty-codes-for-roblox.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-other-people-roblox-account.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/2021-hack-gui-roblox.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-unlimited-robux-cheat.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-health-hack-download.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-no-download-no-verification.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/i-hacked-in-to-roblox-and-found-this-mystery-box.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-clothes-on-roblox-2021.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_off00003fe4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FE4 24720 bytes
SHA-256: 302ba67fd76833bbd42df5005b310699097b5cb963e366dd759869448f402d3a
font_01_sfnt_off0000789e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789E 18860 bytes
SHA-256: b4486e1bd9d71d52c52b710b5492c0638d728269ec90f5f11f55d011de03720b

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