Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb7e8244460256c…

MALICIOUS

PDF

43.2 KB Created: 2021-06-11 09:15:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 94767cd7f641bd791278d75ebb73947f SHA-1: 8c05dc40254dc023d3cddedc96f2144a077b6492 SHA-256: 4bb7e8244460256c82d1819f2c84f4c3850d77f759c298a584c79c865068838d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-free-items-google-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely intended to lead users to phishing or malware download sites.

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/roblox-free-items-google-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-pokecoins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-robux-free-button_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-cheat-engine-noclip_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/hack-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-script-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-military-pants-template-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-install-free_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
font_00_sfnt_off00004e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E56 23952 bytes
SHA-256: 866d469ca58f1383467e73fb10d2623cda6e2bff34e3b29467dc0667120bbe94
font_01_sfnt_off00008531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8531 18600 bytes
SHA-256: fa789ab0306ff36f969ecd087efb8bc743d1beed7cf514bf2b2faa0e491e34da

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