Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26fc4bed257c67a…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 08:03:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b08241dd4f426020d40f944dbc37b6dd SHA-1: 3960f5043a9dd7aa2fd04148cd7706a53b7e1767 SHA-256: b26fc4bed257c67a88163a17ff1ffe0b599616f9d7377ff5bbe09d5e571aa621
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, masquerading as game hacks or generators. The presence of a visual download button and the lure of 'free Robux' indicate a social engineering attempt to trick the user into visiting these malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/tryrbx-site-free-robux-game-hack In PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-coins_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/www-robux_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-hack_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_003_off00004b9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9F 24408 bytes
SHA-256: e383ef7f941639526c034a0c00a4fc87a7308e4b4488cc5845359ba6d260c390
font_01_sfnt_off000083b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B2 18420 bytes
SHA-256: c05555d4ecf6fda64d59e10aa7bbdccb6b0b8342b7e9a04540fdd3a1ca0e8435

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