Malicious PDF — malware analysis report

Static analysis result for SHA-256 39689dff7b1da751…

MALICIOUS

PDF

52.0 KB Created: 2021-06-03 14:03:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1d2379da0e54d8a5a0f23693bded6051 SHA-1: d587f9925b09e6f1aeb905ac3ec68ad84023a7bc SHA-256: 39689dff7b1da751fd2e5ebf7e9ca2b77fc0c869b56471c17f17429c7b1c86f9
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 0.9850

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/how-to-hack-roblox-passwords-game-hack PDF link annotation
    • http://digilibfisip.unla.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roebucks-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
stream_004_off000052d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D9 38632 bytes
SHA-256: 12bcb7c3269d3368122ccb7a298326d86896d428ffd9ad8d161cf43acf6d722a
font_01_sfnt_off0000a7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E4 18672 bytes
SHA-256: bdba0893d178c93f7db8dfb8e75fc125deebdc91658f3b2576607bd83519404f

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