Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5931ae464e78b26…

MALICIOUS

PDF

38.1 KB Created: 2020-05-30 16:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b58613c3bdd94111a45893aae5ea904 SHA-1: d6c684e9668f19a438bcc4741b58f11d0a477e3b SHA-256: a5931ae464e78b26589baa53a6e0c3ab1bfa322c91a8072dd44471345a055b6e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of generated links suggests a coordinated effort to distribute content or malware through these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://tropschocolatefactory.com/uploads/1/3/0/7/130775346/130775346.html#super+bowl+ref+salary+2015
    • http://bridgestonehomestudy.com/uploads/1/3/0/2/130291635/dateniwusexon-wonelij.pdf
    • http://terwapark.fi/uploads/1/3/1/0/131070105/sosufe_mevekumum_peroreve_fezejaje.pdf
    • http://httpssh2019.info/uploads/1/3/1/3/131381782/zitekiximu.pdf
    • http://villasathamptonfinancing.com/uploads/1/3/1/4/131437375/rabinowuxarip_lasekudupabej_xifosevuz_runofaxaku.pdf
    • http://lacannabischef.com/uploads/1/3/0/5/130543064/8f08c4dafa3f7b.pdf
    • http://egccwarriorbags.org/uploads/1/3/1/6/131606073/4128473.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_off000068f7.bin
e45dccb456fc520e27d22666b4a2679e61199d257830a5be1cffe1249c560343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F7 10812 bytes

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