Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f059572fb55b38…

MALICIOUS

PDF

48.5 KB Created: 2021-06-10 12:14:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b18e85ad3de27fede1edaabe0761e364 SHA-1: a037291a17bc9cd2b94110345fdc6a5658060496 SHA-256: d2f059572fb55b3892204e3426cd1eccc4bca5a8fdb305a6311e5f3bb4ba38fe
182 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering 'free Robux' or game hacks, indicative of a phishing or scam lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document may attempt to trick the user into executing commands, potentially to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://netcdn.tw/app/431946152/free-robux-no-email-no-password-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/shirt-template-roblox-download-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/www-roblox-free-games_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-and-tix-generator-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-shirts-funny_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-ant_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5327 24636 bytes
SHA-256: 29ef9bfa4e242574974f6d4254dadbe94be771f766455f4cc9c31b20d3bc193d
font_01_sfnt_off00008b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000982c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x982C 19188 bytes
SHA-256: c01b029773fff1fa0ff3b705707c851f8f341b4dba464f7cd3cfec3288f5432e

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