Malicious PDF — malware analysis report

Static analysis result for SHA-256 685714f545a5ce54…

MALICIOUS

PDF

41.1 KB Created: 2020-08-16 20:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b4955bac85e8ca1b50e9c69fb81cf5 SHA-1: 40010e9436c3d97c56e41874325dd67fc4a6878c SHA-256: 685714f545a5ce54664f4f925333b2b2278939423fd2125fd44b31b54157d167
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is designed to lead users to harmful content. The document body, though heavily obfuscated, contains text that appears to be a lure for 'lonely piano sheet music fortnite'. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO poisoning attempt to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=lonely+piano+sheet+music+fortnite
    • http://zalejiton.zenbeautychester.com/uploads/1/3/1/3/131383363/kofetujiwovojugatiwa.pdf
    • http://files.wls-phd.com/uploads/1/3/1/6/131606222/jajilezutenivale.pdf
    • http://files.aubsblog.com/uploads/1/3/0/8/130813855/6264195.pdf
    • http://files.rbrphotography.ca/uploads/1/3/1/6/131607712/6505765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/aisin_clutch_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/tijozopebuzojavogutudado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/joxojagunikapirin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7461/7511/files/19760587532.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/dna_amplification.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/tipping_point.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/arqueologia_prohibida_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/gozaxotafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/32705132247.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/98856900812.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8553/files/abs_plastic_properties.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_off00006345.bin
b698d1fba12d06f1c0454b68357e159ccfe3fae5fe2e8fe713aca24139c57d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6345 5300 bytes
font_01_sfnt_off0000752c.bin
d5bf6aec8ecb6fa8cac730a408c39daabdb9b88395d75ed42c7606f72ecb9e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 10060 bytes

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