Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7ce26bfc56856b…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 09:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 291d59194104da6b3b74fa1e297c10ce SHA-1: 73cfaaf5d9e046a6af063402803fd3cdd917c908 SHA-256: 4c7ce26bfc56856b26cd5edb855934e4b7f1b736e89dc0788909723ece8947ce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, specifically designed to lure users with promises of free Robux and game hacks. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the intent to direct users to potentially harmful external sites. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a phishing or scam attempt.

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/431946152/free-robux-roblox-promo-codes-game-hack In PDF document text
    • https://i-tech.ac.id/perpus/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-any-gamepass-for-free_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/my-account-was-hacked-roblox_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-hack-999999-robux-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/easy-free-roblox-today_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-promo-codes-roblox-november-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-hack-robux-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-roblox-com-games_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/redeem-roblox-cards-free-codes-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/robux-free-dowload-generator-torrent_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/can-i-hacked-my-own-roblox-account-got_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/hack-para-roblox-2021-noviembre_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-get-admin-on-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-code-free_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-hack-roblox-on-cheat-engine_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/rbx-tools-free-robux_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/synapse-roblox-exploit-free-download_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_off0000317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317B 21948 bytes
SHA-256: 178237d12dc89da38c1bae8082e83c189646683b834999f22663ebf13948a0ba
font_01_sfnt_off0000622a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 19380 bytes
SHA-256: a452d0c191873ed4d1cd88fa82656ca938fba3e74f496bef56901f9d10460b65

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