Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f543afcb67f3f84…

MALICIOUS

PDF

37.1 KB Created: 2021-05-22 12:52:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f33783f23028bb616bf2b5aab14eecb SHA-1: 0af7eee27f279417f43047e0824040f0990a5e30 SHA-256: 7f543afcb67f3f84b78dc84652aa670ca92a86a521305b2bba60dd61161e7c53
82 Risk Score

Malware Insights

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

The PDF document contains multiple external links and a call-to-action phrase, indicating a social engineering attempt to trick users into downloading potentially malicious content. The heuristic 'SE_CLICKFIX' suggests the document may instruct users to run commands directly, bypassing typical macro restrictions. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/minecraft-java-edition-free-download-game-hack PDF link annotation
    • http://mainzer-marktplatz.de/images/www-rubux_GM431946152.pdfIn PDF document text
    • http://mainzer-marktplatz.de/images/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://mainzer-marktplatz.de/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://mainzer-marktplatz.de/images/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mainzer-marktplatz.de/images/how-to-get-free-robux-on-chromebook_GM431946152.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_002_off0000324e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324E 26628 bytes
SHA-256: 0b3e05c2bbb3707df2b72febecd50303d27ed87c78417eb9a58d384d43d0492d
font_01_sfnt_off00006ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC8 18572 bytes
SHA-256: be0be2e0bd1478f571662982334261f36152068b9a395b749ff064ff651796b1

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