Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5659c328b3e0c94…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 05:58:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a97de2f2e9c0740414cd8b26f30f6022 SHA-1: 20a82136958a6780a248a49e0e6981c55d4301b0 SHA-256: d5659c328b3e0c94f5e2f7345d46357d71d76a6b1232d9b1bc406da5c3827aa3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that lead to known malicious redirectors, specifically targeting users interested in game cheats and generators. The document body and heuristics indicate a lure for downloading potentially unwanted or malicious software. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/download-cheat-roblox-pc-game-hack In PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/hack-roblox-da-hood-pc_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/how-to-free-robux_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_004_off0000548c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x548C 26020 bytes
SHA-256: b8af2867c4ca84f258a81f3472c6ce3194ae94eedf77d6f95b2a583d769d6639
font_01_sfnt_off000091a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A9 18940 bytes
SHA-256: 331924c8360945074a2ba5984b49cf9f334982432b9a11c53fc4f0a9f1d91553

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