Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77fed31d837d781…

MALICIOUS

PDF

35.8 KB Created: 2021-05-21 06:12:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 714e96de68db39e5b78fe08a32eecd82 SHA-1: 67147044832e91a3818293332af6814058d39a15 SHA-256: f77fed31d837d7816b6e626da2f25c59ee3f67488c51be24d7b0486ab3dd3314
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for a game hack redirect lure, pointing to a suspicious URL. The document body, though partially corrupted, also contains references to 'free Robux' and the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/rbl-gg-free-robux-game-hack PDF link annotation
    • http://www.compusiteinc.com/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/25-free-spins-coin-master_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_off00003203.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3203 24548 bytes
SHA-256: cf96db91123d36b9307c52e1df0de39d50426782d69027805fd2bc72b726d3dc
font_01_sfnt_off00006a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6A 18376 bytes
SHA-256: 36d8e5c8df31ce5774558eb4dff236d908794f1052653b7bf9d7a2310610d2b4

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