Malicious PDF — malware analysis report

Static analysis result for SHA-256 3146a1374e8dd246…

MALICIOUS

PDF

38.1 KB Created: 2021-05-22 23:13:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 27d020f8faee5e73229216c87f15b00a SHA-1: af6d983e2980c063d9c8322f39ce97b82bb0c091 SHA-256: 3146a1374e8dd2468065738c60e4a7036a47d6c4ef4d91a51c8d497bd16a37be
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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-not-fake-game-hack PDF link annotation
    • http://columbuscigar.com/images/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/rbx-sites_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-unlimited-spins-hack_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
stream_002_off000031f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F1 28904 bytes
SHA-256: 01cf3444a25c3bb85d68b5a76dd12d0915cd17862b58dc6b8a6b61e2a83259df
font_01_sfnt_off00007326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7326 18516 bytes
SHA-256: ca79d80576681ece98af22104654f282f19bfdcccdd95bbb76316d29f9029162

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