Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b978edbf7156eb…

MALICIOUS

PDF

43.6 KB Created: 2021-06-07 04:13:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d489c0cc48a92723706167899127f9e6 SHA-1: 0cd6dbd8760db51069907b79a08c113aa8ff35a1 SHA-256: c4b978edbf7156eb522b0c57fb6a8973f2ce3455b26af813672761ecd2d12e98
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' to entice users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure for users to click through to malicious sites, likely for phishing or further malware delivery.

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.tw/app/431946152/robux-maker-hack-game-hack In PDF document text
    • http://projectunionstreet.com/library/repository/pubg-uc-olx_GM1330123889.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-roblox-roblox-hack_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/pokemon-go-free-play_GM1094591345.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-2021-free-spins_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_off0000507d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x507D 24116 bytes
SHA-256: 0b145136feb10f273392a7fd1e00fa7b819bef437ea36c2db156f3cfe28323e9
font_01_sfnt_off00008711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8711 18444 bytes
SHA-256: 44beedfa2a920db22625d9c6a0d60ead79af2f4fc462414d3d9c53e1bd2e0a47

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