Malicious PDF — malware analysis report

Static analysis result for SHA-256 3360417b56660c32…

MALICIOUS

PDF

55.2 KB Created: 2020-04-19 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 170a7df822ad1c09a775e51501914e18 SHA-1: 460bc699a05767a038aef7bcdb4d77a474bf2f6d SHA-256: 3360417b56660c32ef72924294377f1842f436226971f8d9739535dcb6e00ffa
94 Risk Score

Malware Insights

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

This PDF was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to numeric-slugged PDF files on various domains. This pattern is indicative of a link farm or SEO poisoning campaign. The primary external URI, http://tjamzmusic.net/uploads/1/3/0/5/130588744/130588744.html#lua+charge+body+arboriform, is likely the entry point to this network of malicious or SEO-abused sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://tjamzmusic.net/uploads/1/3/0/5/130588744/130588744.html#lua+charge+body+arboriform
    • http://undertheparadisebridge.com/uploads/1/3/0/4/130488091/cba37d8757830.pdf
    • http://lunarmagickfarm.com/uploads/1/3/0/5/130551920/wixunimat.pdf
    • http://moonpillowquartet.com/uploads/1/3/0/3/130323212/6b17a3ede7a52.pdf
    • http://theblondefro.com/uploads/1/3/0/6/130639183/fojeg-separezix.pdf
    • http://walkerlegalnurseconsulting.net/uploads/1/3/0/2/130272271/2074538.pdf
    • http://kingsizecanary.com/uploads/1/3/0/6/130639540/fuvufagiz.pdf
    • http://hair-and-beyond.com/uploads/1/3/1/3/131384281/61961cd769a155.pdf
    • http://theblondefro.com/uploads/1/3/0/6/130639183/fojeg-separezix
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c3d.bin
42be71eb572e8108655333f0507d6395f159c0c26148de77f9b5147e8451bae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3D 8304 bytes
font_01_sfnt_off0000bc0c.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0C 16036 bytes

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