Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c19fe177ac821d5…

MALICIOUS

PDF

52.7 KB Created: 2020-07-20 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c19022c33b20dbb0c8ef989cb2b52c64 SHA-1: edb45130e33fd1e7e3a48133c4e3f4918d68639c SHA-256: 5c19fe177ac821d53f06a0129165cae783fe30e54fe277056097093ec61a2331
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'winchester ranger safe manual'. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation to attract victims. No scripts were extracted, but the presence of malicious links points towards a phishing or redirection attack.

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.com/wb?keyword=winchester%20ranger%20safe%20manual
    • http://files.soindecatur.org/uploads/1/3/1/3/131383204/356d409.pdf
    • http://files.longchronicles.com/uploads/1/3/0/7/130776503/2426798.pdf
    • http://files.gardenincubator.org/uploads/1/3/1/4/131406735/3146367.pdf
    • http://files.seaquamseahawks.com/uploads/1/3/1/3/131380158/2329242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/99191508651.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/84203838592.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/selulowupipixuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/69886811451.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://pegemuki523724532.files.wordpress.com/2020/07/71969454125.pdf
    • https://faxojotiwiwi.files.wordpress.com/2020/07/79570430494.pdf
    • https://nezirirotur.files.wordpress.com/2020/07/wibokujevuragiruretapozi.pdf
    • https://viterebiz.files.wordpress.com/2020/07/dezoronegavudasuvujo.pdf
    • https://xakisujufo.files.wordpress.com/2020/06/92292396723.pdf
    • https://cdn.shopify.com/s/files/1/0433/8614/2876/files/55939646817.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/41505063326.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/23557429784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/62993159294.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gotisirifiwixi.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_off0000901c.bin
8edc0efc4aa6a9877647132bd7d24d0031ed72bae1d868bbf695b45278dabbd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901C 5080 bytes
font_01_sfnt_off0000a139.bin
314646b40acf80cbbaea9910c9d9d09d3b2856a2524350362edf94dadd579a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA139 10468 bytes

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