Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c089cb65d8ca75a…

MALICIOUS

PDF

31.9 KB Created: 2020-05-31 10:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16318127befdaccf1eb9a2dcfbcd5f89 SHA-1: e55e90552f2dda40d5368d8e37a33fc322c36552 SHA-256: 4c089cb65d8ca75a7d6fc167ae85ac35ec9945a176bc6cac23126219373ac9a0
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO spam operation, potentially used to distribute malicious content or manipulate search engine rankings. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking these links.

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 http://mta-sts.mail.quillskywritings.com/uploads/1/3/0/6/130604806/130604806.html#lead+sheet+manual+pdf
    • http://margowalsh.com/uploads/1/3/0/5/130546237/0b9f52c7689bf.pdf
    • http://mvindm.com/uploads/1/3/0/6/130604018/bimamatimulozazezudi.pdf
    • http://divinesking.com/uploads/1/3/1/8/131871727/42c16b.pdf
    • http://goodwinsonthgo.com/uploads/1/3/1/6/131636774/wepix_fepibexubadat_kulilolifaj_jepabi.pdf
    • http://lucaseportfolio.com/uploads/1/3/0/8/130814729/bokirivagetexom.pdf
    • http://oldworldremedies.com/uploads/1/3/1/4/131406681/muwebutux.pdf
    • http://insidemyjunglecitybrain.com/uploads/1/3/1/6/131606644/fusujufi.pdf
    • https://zomuninelix.files.wordpress.com/2020/05/74477705365.pdf
    • https://zunuxav.files.wordpress.com/2020/05/63245980094.pdf
    • https://xukitivusapu.files.wordpress.com/2020/05/fewumi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052db.bin
adbe63ae57d4b5cfdd152c244bef62f95fa39c7ebeed17f1b676c0d4c9fe341a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52DB 9928 bytes

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