Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d036f98bb1442b…

MALICIOUS

PDF

55.3 KB Created: 2020-06-05 04:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d9a987a2bf1c3aab4440b1964267da SHA-1: 8f7a2071fb6797de19695c9611ca01eb86e1ae65 SHA-256: a8d036f98bb1442ba878f9c71dfd9ddcfbed471d7ddf7524efd670135017878b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, embedding numerous URLs that point to other PDF files. The primary lure appears to be the 'Morphological monster manual' title, directing users to a specific URL. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass of external links, suggesting a malicious intent to manipulate search results or redirect users to potentially harmful content. No scripts were extracted from this sample.

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://nanascomfortfoodskansas.com/uploads/1/3/1/4/131412290/131412290.html#morphological+monster+manual
    • http://cantinafellini.com/uploads/1/3/0/5/130542769/2387655.pdf
    • http://haiafaralazapada.net/uploads/1/3/1/4/131454219/nufiwewowajosub-jaxow-puxobafemo.pdf
    • http://gentlepawstherapypet.org/uploads/1/3/1/6/131606109/tunixidazowim.pdf
    • http://charter-x-yachts.com/uploads/1/3/1/3/131384636/deretuse.pdf
    • http://fluxevents.co.uk/uploads/1/3/1/1/131163782/zujisinujelabatanepo.pdf
    • http://maedaleather.com/uploads/1/3/1/1/131164573/runikanidinonupumox.pdf
    • http://durhamrenivations.com/uploads/1/3/0/6/130640229/6710016.pdf
    • http://hostmaster.abbeleighhouse.co.uk/uploads/1/3/0/6/130604952/duviwipifoxepe.pdf
    • http://mta-sts.junglekitchenmn.com/uploads/1/3/0/5/130542718/2984529.pdf
    • http://irwinmusicacademy.com/uploads/1/3/0/4/130435509/jonovopegidumu-pulujajipoge-safazaxexokefu.pdf
    • http://ajudin.org/uploads/1/3/0/4/130483632/mojunulamuvopafu.pdf
    • http://nanascomfortfoodskansas.com/uploads/1/3/1/4/131412290/terms.html
    • http://nanascomfortfoodskansas.com/uploads/1/3/1/4/131412290/dmca.html
    • http://nanascomfortfoodskansas.com/uploads/1/3/1/4/131412290/policy.html
    • https://nakilopediv.files.wordpress.com/2020/06/xelaxodipabazegodegigi.pdf
    • https://jenapevar.files.wordpress.com/2020/06/jokosiregufefotusisu.pdf
    • https://dodemanakup.files.wordpress.com/2020/06/pogobenegafubixer.pdf
    • https://xuzubika.files.wordpress.com/2020/06/golurubot.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_off0000aa19.bin
18e00d8b65d912426577be39c26d8eae39a633ccf44da04750eeb3fc148e0e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA19 11456 bytes