Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf554189d827bcf4…

MALICIOUS

PDF

38.7 KB Created: 2021-05-20 15:23:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a214bb1bde38e2f9a570750b758a10bb SHA-1: 572e97e40c47c0c9b847b64fd047795f5181f51d SHA-256: cf554189d827bcf4ad295aca9fd2c7ab75ec2c74721eca22f3c7e2983db33cea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector. The document body explicitly mentions 'How To Get 20210 Robux For Free' and includes a 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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/how-to-get-20210-robux-for-free-game-hack In PDF document text
    • http://taskcyg.nl/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/how-to-get-free-robux-without-verifying-2021_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_off000032b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B2 29556 bytes
SHA-256: a369a883922efa0c69a0d1e42362ef59c35241b8bf55d554491dd1de252e7db0
font_01_sfnt_off000074b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 18684 bytes
SHA-256: 6e9c0eecafd635f65838c8dbfb1e23e8457e4c9239d4b33e445d621fd980b18f

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