Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bd72c8c555a6f6…

MALICIOUS

PDF

50.3 KB Created: 2020-04-03 14:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b68eb4dfb3f64a7077bfc37c4109d6f1 SHA-1: d8496b161c9e8e77923bd7cd84aaaf1c17ad35ff SHA-256: 63bd72c8c555a6f613063bdabf17f0a5c705acb2185756a67468bd5a3d58eb32
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of embedded external URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to distribute content or manipulate search engine rankings through a vast network of linked PDFs. The primary attack pattern involves directing users to a multitude of external resources, potentially for malicious distribution or SEO abuse.

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://the-whole-thing.com/uploads/1/3/0/5/130538985/130538985.html#krispy+kreme+chocolate+donut+calories
    • http://prophecyaussies.com/uploads/1/3/0/6/130620950/7415931.pdf
    • http://entrepreneur4life.com/uploads/1/3/0/3/130380037/sukitutirodiju_webabub.pdf
    • http://kongtiao163.net/uploads/1/3/0/3/130313013/tonilum_zuguxojegez_nafokazonalu.pdf
    • http://briaclee.com/uploads/1/3/1/3/131384402/jezevu.pdf
    • http://axisremarketing.com/uploads/1/3/1/1/131163983/2386f723.pdf
    • http://kerrynobrien.com/uploads/1/3/0/7/130776409/pedep.pdf
    • http://capitolaproduce.com/uploads/1/3/0/8/130815381/209ed.pdf
    • http://wheelandwedge.com/uploads/1/3/0/2/130270905/duxuk.pdf
    • http://shtetlfordlp.org/uploads/1/3/0/4/130476152/3771138.pdf
    • http://afsdocs.com/uploads/1/3/0/4/130488416/4069473.pdf
    • http://eaarmada.com/uploads/1/3/1/1/131163761/74de72827567d.pdf
    • http://farmboyconsulting.com/uploads/1/3/1/3/131378898/1310901.pdf
    • http://matthdgamerpacks.com/uploads/1/3/0/6/130621503/padufomepapogeg-vuxirenez-rusitoxikofazu-melajip.pdf
    • http://masterneuroplasticity.com/uploads/1/3/0/6/130639739/7564456.pdf
    • http://moneymogul.net/uploads/1/3/0/7/130776516/jemimez.pdf
    • http://bellcreekagility.com/uploads/1/3/0/6/130620575/6c6dde420556.pdf
    • http://pinkblossombrows.com/uploads/1/3/1/3/131379980/jimexo.pdf
    • http://evolvecounseling.net/uploads/1/3/0/6/130604225/jojefexijudala_wikeburode_zigel_mugutiduxuno.pdf
    • http://swatrobotshield.com/uploads/1/3/0/8/130873807/964eca31cc1349.pdf
    • http://olcreeksoaps.com/uploads/1/3/0/4/130483625/7e4701834d8a0.pdf
    • http://ncexchangeclub.com/uploads/1/3/0/4/130435600/munuxixowasaxakofo.pdf
    • http://petpalsofheathrow.com/uploads/1/3/0/6/130621959/gerebulubaf.pdf
    • http://prairie315.com/uploads/1/3/0/3/130379145/punese-zufetefutenabo.pdf
    • http://lolacaring4you.org/uploads/1/3/0/8/130874350/4299322.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_off000099f1.bin
2852f97986cea18cb4842b963fed2c994dd724afcdd5d148fc4acf2d04d75877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F1 8584 bytes

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