Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fbf3232f0bf904…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 02:10:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8e5c2b45112ec4635270a03edcd98592 SHA-1: 46ba1459d935254eb94102b9a3e3cf1ceb09e826 SHA-256: f9fbf3232f0bf904e18cbb205c904a2b8a4a72bf39c66c2c8dec4609ec8b0e62
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/apps-to-hack-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack designed to trick users into visiting malicious sites, likely as a precursor to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/apps-to-hack-coin-master-game-hack In PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-no-apps-needed_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/is-there-any-way-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-promo-codes-free-2021_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-a-free-thumbnail-on-roblox_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/hack-de-sexo-roblox-tutorial_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-a-bunch-of-free-robux_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-cheat-codes-rocitizens_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://ce.itk.ac.id/asset/backend/upload/ckeditor/files/free-coin_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
font_00_sfnt_off00003327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3327 23460 bytes
SHA-256: e63ae4199be43c7bf8cb07254ca997300a9e111a82fed65f7162f2be413f2277
font_01_sfnt_off00006836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6836 18180 bytes
SHA-256: f0873b9a9a3567aab3602ed3b46c72e29c0674406730caa0d836ec2652e18507

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