Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc515af4ebf8de3…

MALICIOUS

PDF

30.5 KB Created: 2020-03-26 01:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d49a857dcc5b3e22cf2d269ed7b55c32 SHA-1: 4d6327b5d3e9ffdb78baa6ac4dcb66c7c3953647 SHA-256: 9dc515af4ebf8de36b63b634fe20ac1982ba43cf7146647d593d99c851585256
94 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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF documents hosted on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be to create a link farm, potentially for SEO manipulation or to distribute further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://mymissblue.com/uploads/1/3/0/3/130313309/130313309.html#husky+power+washer+parts+1550
    • http://demo1.myshopexpert.com/uploads/1/3/0/6/130620384/tasebetetulo.pdf
    • http://www.snapshotphotography.net/uploads/1/3/0/6/130640061/1095801.pdf
    • http://www.acorncreekstudio.com/uploads/1/3/0/2/130271015/favitek.pdf
    • http://aureajewelry.com/uploads/1/3/0/8/130815228/jinavabik.pdf
    • http://sullivanwoodart.com/uploads/1/3/0/6/130604254/moxipowolefemo.pdf
    • http://sharkdinghy.com/uploads/1/3/0/6/130620230/0d8fbae.pdf
    • http://www.bringmethemoney.com/uploads/1/3/0/5/130590458/1925739.pdf
    • http://wondermentpress.com/uploads/1/3/0/3/130313358/jijet-xevokes.pdf
    • http://drivebeehive.com/uploads/1/3/0/4/130488833/risuw_saparige_vajupakitod.pdf
    • http://restaurantsofgoodtaste.net/uploads/1/3/0/2/130287295/4095c59e3.pdf
    • http://vonv3.de/uploads/1/3/0/6/130603715/0451fe116ce364.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_off00004fc9.bin
3de4700cefcb89925b51f4ef6ecc7d40feb7f0639cd8a5844be92605c7bdce1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC9 7556 bytes

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