Malicious PDF — malware analysis report

Static analysis result for SHA-256 b048940a216a3de9…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 10:45:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f7b460b9d1f8be5c2430cc4dd4b85abb SHA-1: 273afdd1dce31b1f5441e8ba893c693b6ab943ed SHA-256: b048940a216a3de95c2fcaadeb454670a1033424843bdc33f79e0d5a3b72fb8c
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.
  • 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.online/app/431946152/get-free-robux-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-3-steps_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-daily-fb-champion_GM406889139.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_off000050cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50CB 25992 bytes
SHA-256: fbd8d07c47afff0a27841c14b8f64d7f625b18fbe5e34a9af2804df62e28059e
font_01_sfnt_off00008cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF1 18120 bytes
SHA-256: 79ac164380d838bf2943c127f808202d45f8751c05dbd036140e6fb9b1b49848

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