Malicious PDF — malware analysis report

Static analysis result for SHA-256 829677d09942db0d…

MALICIOUS

PDF

43.9 KB Created: 2021-05-16 17:39:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f500e7393334ecc6ec1351b20d8ccf8 SHA-1: a5420a3e6d0259b279f4a52ed7eac27aca8cdc10 SHA-256: 829677d09942db0d96b69c368004c36c51879f62daa13092ae52c631442f2ac6
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 SEO-optimized PDF files, indicating a link farm or spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URIs and the overall structure suggest an attempt to redirect users to potentially harmful content or facilitate further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/what-is-a-minecraft-client-game-hack PDF link annotation
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://bibliotheque-perrigny-les-dijon.fr/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://www.freenom.comHeyIn PDF document text
    • https://education.minecraftIn 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_off00005021.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5021 25628 bytes
SHA-256: f4823a2328f3026f8e8729191373bdfdccc78ed2c52022c0b5213d54ca15b63a
font_01_sfnt_off00008a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A58 18008 bytes
SHA-256: f402f21c661d1e01b215e02d2fc5d7c867c0257932a901a78bdda083b1da0465