Malicious PDF — malware analysis report

Static analysis result for SHA-256 526297c6c1ee0000…

MALICIOUS

PDF

31.9 KB Created: 2021-06-20 10:55:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8d9122d2f605bc5d369ac784f128196e SHA-1: 8caf9d7bb817ee2d08a5c47d61dca652f20db22b SHA-256: 526297c6c1ee00002dd5f56d4d0a3e328e49bcff29de5e7980677ae76c2e9b73
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to websites offering free in-game currency or cheats for popular games. The document body explicitly mentions 'Robuxian Tutorials Free Robux Code Generator' and includes a call to action, indicating a lure for users to click these links. The presence of a 'Password-protected archive handoff' heuristic suggests that the linked content might be an archive requiring a password, a common tactic to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/robuxian-tutorials-free-robux-code-generator-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/roblox-fast-card-codes-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-human-verificationcom_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-jailbreak-hack-deutsch_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_off00002a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A97 20720 bytes
SHA-256: 58cfa29865bf66fb4238b8c5486b3caef5dbeddfef135cc97f9196a8588461c7
font_01_sfnt_off00005748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5748 19188 bytes
SHA-256: e8e7709496fb19f4e9b6fe8344348e8e1ec50a25450b644cdd77778fb37ce974

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