Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f155c324ef7093a…

MALICIOUS

PDF

42.0 KB Created: 2020-09-28 20:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9046dda81163930d15a782c9665b379e SHA-1: a44054e572f7f6eeeed353a13ec3d15b1efff11b SHA-256: 0f155c324ef7093a6b2532558dd44d66f69ee9365c137afbce97fe85c686836a
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO manipulation or to host malicious content. One of the primary links redirects through a known malicious infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cctraff.ru/mozel?keyword=catalytic+activity+of+enzymes+pdf
    • http://waduw.jamesphelan.com.au/uploads/1/3/2/6/132681192/tabav_senazata.pdf
    • http://pujudafoz.shadowhillspresbyterianpreschool.com/uploads/1/3/1/3/131378816/6788505.pdf
    • http://bajib.wichitajoyorganics.com/uploads/1/3/0/8/130814339/mafaxekoz.pdf
    • http://zugugij.thewellwithinus.com/uploads/1/3/1/0/131069934/8bcf48b0af5c32.pdf
    • http://files.dustfreelv.com/uploads/1/3/2/6/132681426/8687166.pdf
    • http://files.ncherbsociety.org/uploads/1/3/2/3/132302759/pufabofek.pdf
    • http://files.grotonh3.com/uploads/1/3/1/6/131606256/wirezexomulexepiwore.pdf
    • http://wiwurur.giselabeckius.com/uploads/1/3/2/7/132712348/8022464.pdf
    • http://dorokake.jetchcreations.com/uploads/1/3/1/4/131409090/vupamifulila-zarobu.pdf
    • http://xepudeb.chenyilei.net/uploads/1/3/1/8/131872295/wulagilinaj.pdf
    • https://site-1037157.mozfiles.com/files/1037157/xavoliwapokozamijumel.pdf
    • https://site-1037113.mozfiles.com/files/1037113/notasenivitudokak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0011/1002/files/rixebovexowumuwafop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1738/7682/files/securecrt_7._3_portable.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0424/files/11626918613.pdf
    • https://cdn.shopify.com/s/files/1/0462/4351/2474/files/discrete_fourier_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/91736474329.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_off0000658e.bin
d4ed98d6fed5c505c5f91b2b8b5ceb525ed074f7745093028ca69488232f2342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 5324 bytes
font_01_sfnt_off000077b7.bin
db8fc52a58e0c57c93902ab2d931556e0334275a05a08695899dfbbb89be9f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B7 10356 bytes

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