Malicious PDF — malware analysis report

Static analysis result for SHA-256 a779c876461f2e3c…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 06:33:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5bcd983ec43238817816b1b5dbe8551a SHA-1: dfe614072b472ccbef7db148c6d6704041e18cb7 SHA-256: a779c876461f2e3cd886c31b9b42107b52611f7e23ea31c34fce47cb4e24dcf5
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 0.9980

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 http://netcdn.tw/app/479516143/how-to-get-minecraft-bedrock-edition-for-free-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/hack-para-volar-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-on-alcatel_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-to-get-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-on-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-roblox-money-no-survey_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-redeem-codes-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/frre-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-injector-for-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-admin-in-any-roblox-game_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-catalof-20212021-for-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hacks-en-csgo-roblox-en-espaol_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/get-unlimited-robux-for-free-new-hack-2021-roblox-working_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/boku-no-roblox-remastered-hack-auto-farm_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-fly-cheat_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-bandana-on-roblox_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_off000030b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B8 21960 bytes
SHA-256: 85a8d1e95bc67ecc6b03e7a1d76085493ec1476e539b33a984d843851de3ef03
font_01_sfnt_off000060cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CB 18720 bytes
SHA-256: 8749f690aacce1ff2d40288e6cd65b377fcb09a0c55c4616b39fbcf3e372c4de

Open this report in the interactive analyzer, or submit your own file for analysis.