Malicious PDF — malware analysis report

Static analysis result for SHA-256 6622e8a65473ea0f…

MALICIOUS

PDF

37.8 KB Created: 2020-05-23 04:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4097177bf6061f7d1a4045a0ee2e20ec SHA-1: bf533ab98094cd93f9cbd42c82eeeac6162f0acb SHA-256: 6622e8a65473ea0f481860a3d8fd0c294ed4b97ab2cb8b69049282b79ae856e0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document 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 identified a mass of external PDF links. While no scripts were directly extracted, the presence of numerous URLs suggests an attempt to drive traffic to potentially compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://chaseholdingscorp.com/uploads/1/3/1/6/131637606/131637606.html#nier+automata+ending+f
    • http://khconstructdemo.adviser.live/uploads/1/3/0/6/130639526/dd47696bfec2.pdf
    • http://nxlevelgolf.com/uploads/1/3/0/7/130776101/pidurut.pdf
    • http://riverhawkguidedfishing.com/uploads/1/3/1/3/131380045/ad5f2f1752bf.pdf
    • http://haggertyhandyman.com/uploads/1/3/0/2/130270768/4570427.pdf
    • http://midlandsfestivalofflight.com/uploads/1/3/0/7/130776739/xejapivolegomofudori.pdf
    • http://gtwutu72.org/uploads/1/3/0/8/130814106/xudulowez.pdf
    • http://followthesun.earth/uploads/1/3/0/6/130621506/857abe7cc7539bd.pdf
    • http://keepsakesmn.com/uploads/1/3/1/1/131164538/23620005ab0.pdf
    • http://lovelyladychronicles.com/uploads/1/3/0/6/130621708/xazixujajasufowefawu.pdf
    • http://katrinadasilvaart.com/uploads/1/3/0/6/130639803/1772402.pdf
    • http://mariakalaffdesigns.com/uploads/1/3/1/3/131379530/2491707.pdf
    • http://rossanatransteaching.com/uploads/1/3/1/4/131482916/3442904.pdf
    • http://webdisk.alohapana.com/uploads/1/3/1/0/131070880/6413223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000696f.bin
5039a23ade03b99ab48b13391e6c194408447f0ce11e48313d63bfdcad037bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696F 10132 bytes

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