Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb188cb8c2c4c496…

MALICIOUS

PDF

39.8 KB Created: 2021-05-10 14:08:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bba515360a451f8aa3c00b47336d76e6 SHA-1: a48d43d8b1ef68721c22740c3fb93e675393120e SHA-256: fb188cb8c2c4c4960e5cd3b1cee419b1dd860fc9e7cf22dbfbce1a777474814b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links and text that promote a 'free Robux' generator, a common lure for malicious downloads. The critical heuristic firing indicates the primary link leads to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading a second-stage payload, likely a downloader or trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9566

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox36.com-free-robux-game-hack In PDF document text
    • http://stitchingart.com/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://stitchingart.com/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://stitchingart.com/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://stitchingart.com/images/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://stitchingart.com/images/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://stitchingart.com/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stitchingart.com/images/coin-master-deals_GM406889139.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
font_00_sfnt_off000038dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38DC 27984 bytes
SHA-256: 966da3b08d90d5985cf21884eb6f0765520e8bea7d784b8535ed53d1ea90754b
font_01_sfnt_off000078cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78CF 18756 bytes
SHA-256: 75a7293df35b739ae2294dba45007dab7b7658b4df7c6a7e046c10781a1fd260

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