Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae76c17f54fbbff…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 14:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e68b88ed07b8c9d3d746a0a82400fed5 SHA-1: 96eb7ea242caf5c2ec52a73c54b37cd779687a6d SHA-256: 9ae76c17f54fbbff74c6bf5a6e4f8ad4e82d2f510b9fa9af2f75c3ede3f954d2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links and text explicitly referencing 'Robux Code Redeem Free' and 'game hack', which are common lures for malicious content. Heuristics confirm these links point to known malicious redirector infrastructure. The primary malicious URL identified is http://netcdn.tw/app/431946152/robux-code-redeem-free-game-hack, which likely serves as a gateway to malware or phishing sites.

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/robux-code-redeem-free-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-free-pokecoins-xyz_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-vip-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-2021-november_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hacks-for-pet-ranch-roblox-for-free-coins_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-999999-robux-2021-pc_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-pe-free-download-ios_GM479516143.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_off00002f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4B 22744 bytes
SHA-256: 73ab9a6afaaacbe12bfed6daeb01d3669e39fba5a9990524f47879a1a025d913
font_01_sfnt_off00006250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 18964 bytes
SHA-256: 659219e45b5c909150576f9c31798d7d4921083ed23cfcaf0c0f2e6f9255126a

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