Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec861fded9ca29d…

MALICIOUS

PDF

40.9 KB Created: 2021-05-14 12:08:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 76e8a6ca21f7a1ad113844a6970659dc SHA-1: aace73c3224d40e1899bd2d854ef45140cb1a8f7 SHA-256: dec861fded9ca29d039d9db876b14c02593abb399c942736fa4470dfdcd77cd9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files hosted on the same domain. This pattern is indicative of a link farm or SEO abuse, potentially used to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs supports this assessment. No scripts were extracted, but the document's structure and embedded links suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/coin-master-links-2021-game-hack PDF link annotation
    • http://simon-skov-fougt.dk/billeder/hack-download_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-free-coin-and-spin-app_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
stream_003_off00004787.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4787 23744 bytes
SHA-256: 03310c6e41816c89357442a89d3e7c41e3b27d86617574f9915164aef5f856fc
font_01_sfnt_off00007d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D96 18116 bytes
SHA-256: 6c2a50199d9b46215a875dc9668b69110360059bd5b64fd0f73058dd3f4c0f4e

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