Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bba176e516b5f76…

MALICIOUS

PDF

32.8 KB Created: 2020-04-09 01:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0826907a211b22880d57beb580d43c8 SHA-1: 9d6a7bdc08c3eda321c4156c9241b66214eb8fd1 SHA-256: 4bba176e516b5f76d10036e7a8238a6bc5ecc3498d12a3948c8c60bb27ed294b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links.

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://striba.net/uploads/1/3/0/6/130639679/130639679.html#aaron+marshall+britain%27s+got+talen
    • http://nyc-update.com/uploads/1/3/0/5/130552053/ruxuwobesowiza.pdf
    • http://lindagreenwoodgreenlion.com/uploads/1/3/1/4/131408027/sojuxopawupekavox.pdf
    • http://alteredamerica.com/uploads/1/3/0/5/130590391/xogakuvat.pdf
    • http://rahman4ga.com/uploads/1/3/0/4/130483817/8054442.pdf
    • http://bucketmedia.net/uploads/1/3/0/2/130272362/8a83f55b46196f9.pdf
    • http://missdarkskinminksonline.com/uploads/1/3/0/2/130289670/6304651.pdf
    • http://meghanjohnstonrealtor.com/uploads/1/3/0/6/130620715/4e9ca7fa8.pdf
    • http://runnersofthenish.com/uploads/1/3/1/4/131438190/bavadib.pdf
    • http://adriennerempel.com/uploads/1/3/0/3/130324241/getojobaxadubivako.pdf
    • http://irinaderbina.com/uploads/1/3/0/6/130604207/1551467.pdf
    • http://websitedesignfr.com/uploads/1/3/0/8/130813796/498315.pdf
    • http://ml-md.com/uploads/1/3/0/2/130274304/4173036.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_off000059a8.bin
5ab02e7de9241d4568ec2e0284279ddcfc4600045dd19998402f71a4deeb4509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A8 7244 bytes

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