Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c029ac67530cbb…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 10:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 20e28b67ef789307322c03f8572ad042 SHA-1: 3b55a3b6c365d7387017518b273dfb506dee381e SHA-256: 40c029ac67530cbb1b0270b02df3dad34227e998845d726fe319563a02633465
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure at http://netcdn.tw/app/479516143/how-to-use-redstone-game-hack. The document body also contains this URL, reinforcing the lure. The presence of embedded PDF fonts suggests potential exploitation or obfuscation techniques, aligning with client execution methods.

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/479516143/how-to-use-redstone-game-hack In PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/robux-win_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/ipad-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/bad-bussiness-roblox-hack_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-booga-booga-auto-farm-hack-afk-farm-working-2021_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-robux-genetator-hack_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-copy-pasta_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/robux-hack_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-deep-web_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-always-day-hack_GM431946152.pdfIn PDF document text
    • https://phy.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-online-free-download_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_off000032af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AF 22352 bytes
SHA-256: 134e735e45baf85cf6195d78706fc2696f12a2d3c1cdea542378af275ddc445f
font_01_sfnt_off00006475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 18400 bytes
SHA-256: 8a198e1e9864b91c1b5565f58586ff873331d1eac158ce45a3b769fb78f5fc68

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