Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8392a1b29c95013…

MALICIOUS

PDF

40.2 KB Created: 2020-08-08 18:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e63ff18fb7c3fedd330f4223dc7d5f0 SHA-1: fb2d72292bdcb8cf40616e3fae0bd094f1eabe34 SHA-256: e8392a1b29c95013a1c65d7cd5f806be749aa07e6d03da42432238931455f713
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=adjetivos+posesivos+en+ingles+y+espa%25C3%25B1ol+pdf. The document body also contains this URL and numerous other links hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attack designed to lure users to malicious content.

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.ru/pify?keyword=adjetivos+posesivos+en+ingles+y+espa%25C3%25B1ol+pdf
    • http://files.roseofhopefoundation.org/uploads/1/3/1/4/131408183/3290842.pdf
    • http://files.mallorywinkler.com/uploads/1/3/1/3/131398125/babezumubir.pdf
    • http://pafexa.centelmedia.com/uploads/1/3/1/4/131483337/vivajokaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/8154352612.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/39466407396.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/76492829887.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/macbeth_summary_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/before_i_let_go_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/mifebufofidevugusigepop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/pewobuto.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/38712705346.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/2013_ford_f150_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/9116/3291/files/florida_d_license.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/sociology_by_anthony_giddens_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/magetikovuboj.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a8e.bin
28ddd0a28f2e99cc79f7ae246769ffd9d4a3635cc0490649dd97005b97823f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8E 5552 bytes
font_01_sfnt_off00006d5d.bin
de5f20250f5c93f5d70430ed4d0732466c502bdbe1081b188c88c271248e8b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5D 11024 bytes