Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c3d99413b7b60a…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 07:32:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1006630094ef392e4787860b8f5bd1d5 SHA-1: 27f61638ddcd3de017c1d1e311d2c580b98d5127 SHA-256: b6c3d99413b7b60a5bc445a24b1a6b85e0cdfaa431163f8bebcd1a355ad1ffae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The primary malicious URL identified is https://netcdn.online/app/431946152/roblox-free-robux-website-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure to drive users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-free-robux-website-game-hack In PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/tiktok-for-free-download_GM835599320.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C2 27440 bytes
SHA-256: 5361c1f27debeb55029bd18b0a317633f8c81937b6c8d1bafcd01c29d2b8f0da
font_01_sfnt_off000093d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D4 3084 bytes
SHA-256: b448c6c858224a14757a13cbe47c12c6716f10d172e9da68cc927666a30d918f
font_02_sfnt_off00009e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7A 18508 bytes
SHA-256: fbcd203c7e924a0ebec4ef4aa0eb55ec8b14d1abcc2767c4f5d3ad1ccc86f8e3

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