Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20ca4598f0cd4b1…

MALICIOUS

PDF

41.3 KB Created: 2020-10-13 21:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb2ecb1c2b48d8754394aff9f09faf55 SHA-1: 7a93e5cd1f74032f30b0e77b16003e1b76e4ee5a SHA-256: c20ca4598f0cd4b1085a00e036b2f25099010688d1aca197a241c72c2e42fbd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Weebly-hosted files, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=charles+dickens+david+copperfield+pdf+espa%25C3%25B1ol'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent.

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://ggtraff.ru/strik?keyword=charles+dickens+david+copperfield+pdf+espa%25C3%25B1ol
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/gowijipomunolu_lirogub_loletakimup_rozugofekowe.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/da50c7e0ec8f483.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/divili_dapixi.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0469/2728/2331/files/fate_saber_lily_zerochan.pdf
    • https://cdn.shopify.com/s/files/1/0435/5833/8715/files/los_olvidados_buuel_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7972/files/malibuwizuberabodew.pdf
    • https://cdn.shopify.com/s/files/1/0266/7711/7125/files/norse_gods_of_healing.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/21573263419.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_off000060a3.bin
d9bd8ce324f2174a8abc8e1d6bd7af7096ca4b2607fbe86624133f2de0c635f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 5484 bytes
font_01_sfnt_off000072ff.bin
4d5cda42de3fde3dcc1694193e8b002af432de8b0f4e38f8a82fb6ae81a12d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 10196 bytes