Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba8e7d88a48529e…

MALICIOUS

PDF

38.6 KB Created: 2020-06-03 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27505f50707fddc444b2c81695f04a2d SHA-1: 4c781cab4f19e4db4bab72a1bd063bf028676a82 SHA-256: cba8e7d88a48529e7b15fa12f234f51b73ea1c353198f9d8f5b542c269b1cb64
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to a network of these SEO-optimized PDF files, likely as a prelude to further malicious activity or content delivery.

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://a1492407xstreamtravel.xsideas.com/uploads/1/3/1/1/131164506/131164506.html#3ds+max+vray+mirror+material+free
    • http://fudool.com/uploads/1/3/1/3/131398401/mudunumidixev.pdf
    • http://trouverunrenovateur.com/uploads/1/3/1/4/131411197/jutidobilujuzuwoke.pdf
    • http://daphneecuisine.com/uploads/1/3/1/8/131871856/wefasibifubenibuvume.pdf
    • http://aperitif-sticks.at/uploads/1/3/1/4/131407493/zarotapudus.pdf
    • http://mgeducation.net/uploads/1/3/1/4/131483598/4173717.pdf
    • http://thebirthbundle.com/uploads/1/3/0/3/130379522/1930973.pdf
    • http://rattingonrodents.com/uploads/1/3/0/5/130546434/deguvofe.pdf
    • http://bigdipbirding.com/uploads/1/3/0/5/130588278/f21c6.pdf
    • http://admin.heloisepilkington.com/uploads/1/3/1/0/131071256/b85b6df07b47.pdf
    • http://sgrimo.org/uploads/1/3/0/6/130605119/630591.pdf
    • http://a1492407xstreamtravel.xsideas.com/uploads/1/3/1/1/131164506/terms.html
    • http://a1492407xstreamtravel.xsideas.com/uploads/1/3/1/1/131164506/dmca.html
    • http://a1492407xstreamtravel.xsideas.com/uploads/1/3/1/1/131164506/policy.html
    • https://guwunib.files.wordpress.com/2020/05/xidupir.pdf
    • https://zoboxon822523527.files.wordpress.com/2020/06/56814209732.pdf
    • https://kexunezelip.files.wordpress.com/2020/05/mivisaxunupateliliba.pdf
    • https://botojime.files.wordpress.com/2020/05/bewepole.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_off00006a45.bin
c6ef75d6e3fdef6edda57a18db9e3a3c7eff2649abc3442a565a0c71d1ba20a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A45 10532 bytes

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