Malicious PDF — malware analysis report

Static analysis result for SHA-256 6807817a5653cfdb…

MALICIOUS

PDF

44.7 KB Created: 2020-07-09 15:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b82c8e766249b08e172b019e1b359062 SHA-1: d0979572fe9fa57f1de046f7291e098168d358ab SHA-256: 6807817a5653cfdb4e5113c758fc7ee9472bf6d42b074b097a414adaf5936375
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to suspicious domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, suggesting the document is designed to redirect users to harmful sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/wb?keyword=direct%20veneer%20pdf
    • http://files.optimalstopping.com/uploads/1/3/2/6/132681316/1326320.pdf
    • http://files.ornamentsofexpression.com/uploads/1/3/1/4/131455883/vojosa.pdf
    • http://files.isabellegiroux.net/uploads/1/3/2/6/132681566/wopote-kusenawir-zogasofomira.pdf
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdf
    • http://files.bowlrevs.com/uploads/1/3/0/7/130739764/pafimuzarenib.pdf
    • http://files.academiescollaborative.com/uploads/1/3/1/3/131383889/7a1084b.pdf
    • http://files.tlquachfilms.com/uploads/1/3/1/6/131606819/1bcec1b4c1.pdf
    • http://files.onesketchyartstudio.com/uploads/1/3/2/8/132814272/81b3f276f205fce.pdf
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdf
    • http://files.sharpspoonpictures.com/uploads/1/3/0/7/130776481/kelejot-limemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mizarexil.files.wordpress.com/2020/06/difeme.pdf
    • https://duvudikugaju.files.wordpress.com/2020/07/bepeguwifez.pdf
    • https://repaxazaw.files.wordpress.com/2020/06/zepidosimizudegexatuxew.pdf
    • https://xetegiremu.files.wordpress.com/2020/07/20733492915.pdf
    • https://bidazinefak.files.wordpress.com/2020/06/topivofafolozenusadatikoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46824776831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072cd.bin
f069aef52d57a33a2d58981f67559a58fbecd93b2cafb518f8e923ca242aa364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 4464 bytes
font_01_sfnt_off0000820b.bin
ec6dd412ab310b673e18bf7fc2303b51a42343a072fb0b18b75e6919f702336b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820B 10592 bytes

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