Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec14c31cfdae1edc…

MALICIOUS

PDF

39.9 KB Created: 2020-03-21 12:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc20879c3ccee7d1950872af9d0a530e SHA-1: 1c56a2e4e701bc6197918ee1474b5b5d4455ff59 SHA-256: ec14c31cfdae1edc7013a745bdd00637df398e698a219b7a17e12a372690f307
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier with high confidence as malicious. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links is http://beyondhillco.com/uploads/1/3/0/2/130287727/130287727.html#old+man+logan+marvel+contest+of+champions. This behavior suggests the document is part of a link farm designed to manipulate search engine results or 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://beyondhillco.com/uploads/1/3/0/2/130287727/130287727.html#old+man+logan+marvel+contest+of+champions
    • http://youarenotaloneproject.com/uploads/1/3/0/6/130639785/7143428.pdf
    • http://www.chandellesummer.com/uploads/1/3/0/5/130590186/resekivumiw-kodugid-dejasu-xaruduzofe.pdf
    • http://churchplantercoach.org/uploads/1/3/0/5/130590478/5562680.pdf
    • http://yogaandtherapy.com/uploads/1/3/0/6/130621208/6461026.pdf
    • http://allyssacheon.com/uploads/1/3/0/5/130544379/xeruzura_tapineroxeg_zipuvojadetitel.pdf
    • http://rohitiswrite.com/uploads/1/3/0/2/130272516/gofupufelovol.pdf
    • http://samanathavandyke.com/uploads/1/3/0/6/130604369/pilubuzido.pdf
    • http://floridasafestaff.com/uploads/1/3/0/5/130547812/tagebo.pdf
    • http://phreexone.net/uploads/1/3/0/5/130551267/vupiferuj_zijupol_vuliwef_banobusosesume.pdf
    • http://vatwizardsinc.com/uploads/1/3/0/6/130621285/2216847.pdf
    • http://pricklypawshedgehogscolorado.com/uploads/1/3/0/7/130739159/wozafadokipujololuze.pdf
    • http://barbaraandridge.com/uploads/1/3/0/5/130589239/253e58a.pdf
    • http://www.jennifercoffman.com/uploads/1/3/0/5/130540159/sirimolopatosokipobe.pdf
    • http://rudiconradie.com/uploads/1/3/0/8/130814900/1772b77e9a.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_off000072ef.bin
fb9f21a56150e1603877564d8789542d7c26ced8869c1ffee45dacccfb81e407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 8156 bytes

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