Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b056c8879049ecf…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 16:55:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b0e94b1b8651156dfb143f2c96d2b34 SHA-1: 982f02743f1f07001959c92da4fe72bbdfe424a0 SHA-256: 0b056c8879049ecf1622dbd9aaecba5d1c700c3be7cd2158682d6f4ab7fffcaf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a malicious domain, identified as a game hack or free Robux generator lure. The ML classifier also flagged this PDF as malicious. The primary malicious activity observed is the redirection to the URL https://netcdn.online/app/431946152/apps-that-give-you-free-robux-game-hack, which likely serves as a landing page for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/apps-that-give-you-free-robux-game-hack In PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/wurst-115_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-unlimited-coins-in-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_004_off00004e66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E66 23964 bytes
SHA-256: 478ea4ce33c17e6788a736653edf10382a678fff5c23ec4d692e68f2ff418c4a
font_01_sfnt_off0000852a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852A 19084 bytes
SHA-256: 837a639daa187fc447bd118567dc66774ab6c99c19a83daf34219dbfdd013636

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