Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c87952cb923fcaf…

MALICIOUS

PDF

43.8 KB Created: 2020-04-11 08:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d185348cf23f07229ea3066c5da6e5b8 SHA-1: 6629f4f24583f20dfba63774a32fc3fc42837582 SHA-256: 8c87952cb923fcafa4ded56f468f20dc38a16955e7a2ce188133cae4bc771a94
94 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The embedded URLs are likely part of a campaign to drive traffic to potentially compromised or malicious web pages.

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://captainjoetheicon.com/uploads/1/3/0/5/130544635/130544635.html#true+grit+charles+portis+1968
    • http://vivalasvegancatering.com/uploads/1/3/1/3/131380337/ruxovenu-xakiv-geginewobob.pdf
    • http://sharathsri.com/uploads/1/3/0/9/130969003/b484758f70e4e.pdf
    • http://fantasycashhog.com/uploads/1/3/0/2/130288602/kasogorumuzetizowa.pdf
    • http://kemonaditas.com/uploads/1/3/0/6/130604744/pemiriponekefase.pdf
    • http://nsjoinery.com/uploads/1/3/0/7/130775558/lujufajosunexeke.pdf
    • http://anew-view.com/uploads/1/3/1/3/131379946/9093453.pdf
    • http://jobertscruiseguide.com/uploads/1/3/1/0/131069806/5de50442a4abb.pdf
    • http://myantifacebook.com/uploads/1/3/1/0/131070979/guzedituvozoxujego.pdf
    • http://simpleeating.net/uploads/1/3/0/6/130605341/1a17659b95.pdf
    • http://jenniferhaney.com/uploads/1/3/0/5/130542953/texukimo-rolanibegepipo-fotugodelof-bugizowaniwos.pdf
    • http://poascotland.org/uploads/1/3/1/3/131379769/fibewoduvivexesa.pdf
    • http://awelldressednest.net/uploads/1/3/0/2/130274098/e2367c295d45dd.pdf
    • http://enlhelper.com/uploads/1/3/1/4/131453967/zenidexuma.pdf
    • http://mayleesears.com/uploads/1/3/1/3/131379584/e3c99765.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007901.bin
f26eff88100aecd6dd67f7494dd5193882be0a301063d8a6601693e5223cee06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7901 8276 bytes
font_01_sfnt_off00009916.bin
0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9916 2484 bytes

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