Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9a76552cfd7127…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 21:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f2ec5d759b8ea75712c0b875600c47 SHA-1: 06496959defab628429b24aaaa7de5440bc69485 SHA-256: 5d9a76552cfd712789a306d783aa04b3d8c43c86b4d6450c641984f4f60f379f
154 Risk Score

Malware Insights

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

The PDF contains a lure related to 'acoustic guitar chords pdf download' which, upon inspection, redirects to a malicious URL. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the embedded URL heuristic confirms the redirection to suspicious infrastructure.

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=acoustic+guitar+chords+pdf+download
    • http://files.welldoneexperience.com/uploads/1/3/1/3/131398184/kifepaba-pamakutajosak-vizizaruv-lojowiwolitifik.pdf
    • http://files.cristinaliomakeup.com/uploads/1/3/1/3/131378975/popovowugofu.pdf
    • http://files.antoniocoach.com/uploads/1/3/2/6/132681316/85b91a4acc4b7c3.pdf
    • http://files.northwestcampingresources.com/uploads/1/3/1/1/131164132/tivotijegikugasosuk.pdf
    • http://files.themakeupguy.net/uploads/1/3/1/6/131637656/8812074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/90299438323.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/19639584665.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/zoxefegevadovix.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/ziwofujawasawigurepo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/38018097361.pdf
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/que_es_un_acronimo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/20589963521.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/zitenomekadulobiwisavib.pdf
    • https://cdn.shopify.com/s/files/1/0439/2858/4347/files/75556202338.pdf
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/dixofawasamarugakuviwobef.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/wogikilaxoguputufagogufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/rovifama.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/xerukixumukekatomakig.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_off00006528.bin
18c34392aadd53f3811916c54c99595b663f531e9f8e265a1592917210663bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5496 bytes
font_01_sfnt_off000077ea.bin
eb192708af57df62d123945552cb00f57cc1b2f8da7a049d8969c047ebb90d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 10480 bytes

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