Malicious PDF — malware analysis report

Static analysis result for SHA-256 27da639b0bcc4c07…

MALICIOUS

PDF

41.3 KB Created: 2021-05-20 21:18:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 79dfd252bad7e57554ec222972485372 SHA-1: 10005c124ae369bfd46dd9ee33041bab914889e5 SHA-256: 27da639b0bcc4c0795586edbf4b09409c2dddcb363ce9854c5828623394126f5
82 Risk Score

Malware Insights

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

The PDF document contains lures for 'Free Robux Gift Card Codes' and includes a heuristic indicating an instruction to disable security software, suggesting a malicious intent to bypass defenses. Embedded URLs point to external resources that likely host malicious payloads. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7534

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/free-robux-gift-card-codes-2021-game-hack PDF link annotation
    • https://eyeonhimalaya.com/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003434.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3434 28356 bytes
SHA-256: 098aa98c2c338dfc28c190eeb97e72a22b20f91df98f6959ccae65efe35ed59b
font_01_sfnt_off00007397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7397 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00007d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D81 19044 bytes
SHA-256: a83203ba6d4d8e4db234da74518c811315008a13a6a61ff598d06d89853e7c2b

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