Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e1906367e669a7…

MALICIOUS

PDF

33.7 KB Created: 2020-04-14 03:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3542841cfb4225fb8030a1caa9b879a6 SHA-1: 725f709ac3ee5a41e571075b45abab49bb582163 SHA-256: f3e1906367e669a77e1a1d77a7bcb7310cd75db950422da048ab15633443af76
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'blockshop shopify theme free' and authoring application details, but the primary malicious activity appears to be the mass distribution of external links.

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://northwesternfertility.org/uploads/1/3/0/8/130874338/130874338.html#blockshop+shopify+theme+free
    • http://fourclosure.net/uploads/1/3/1/4/131453496/6613792.pdf
    • http://b4uburn.com/uploads/1/3/0/7/130739129/5d0515a3ddf.pdf
    • http://wearebarnfield.com/uploads/1/3/0/6/130603834/31572faa89f35.pdf
    • http://alaskahistoryday.com/uploads/1/3/0/2/130287289/8846582.pdf
    • http://baremls.com/uploads/1/3/1/3/131381067/veduw-liraxugojarobar.pdf
    • http://amberartglass.com/uploads/1/3/1/4/131437987/defalazuse.pdf
    • http://nskimpex.com/uploads/1/3/0/2/130274145/mamozibutokovada.pdf
    • http://beachwoodadventures.uk/uploads/1/3/0/4/130491271/2955239.pdf
    • http://infinitywear.net/uploads/1/3/1/4/131407005/40e311d5f494.pdf
    • http://igniteyourstrengths.com/uploads/1/3/0/5/130551033/f50f8283.pdf
    • http://dkbhardware.com/uploads/1/3/0/6/130620644/4efddd.pdf
    • http://naramataplayschool.com/uploads/1/3/1/4/131438038/voraxenevus-jazasedofetilij-namorolom.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_off00005c43.bin
a1eafca7ada24957eb94bd71b980a95dd5ee9a6d0e3fc86d6ed119572b19711d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C43 7936 bytes

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