Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3837101a4b6ccc9…

MALICIOUS

PDF

42.2 KB Created: 2021-05-15 06:38:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 959eab7e185ad20670418a2768993f2a SHA-1: f917b92c0e8cc86fdb23c8050e12d90464bd519b SHA-256: b3837101a4b6ccc9cd25ba6b45904f13ca985a9201539f69428b110d3884e3eb
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 0.9971

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.xyz/app/479516143/how-to-get-free-tokens-in-minecraft-ps4-game-hack PDF link annotation
    • http://kontaktadig.se/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/hack-client_GM479516143.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_off00004a5b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A5B 24516 bytes
SHA-256: c21c1577e233d69999a4693509363052dcfb86eb480b24b5528b6c3ead114e6d
font_01_sfnt_off000082c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C3 18260 bytes
SHA-256: 6b17d904edba380b1c0a1521f110ced755ab41ddc916bfb976523684f5146024

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