Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d68a996afad32f…

MALICIOUS

PDF

43.9 KB Created: 2020-10-31 02:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92d5ffb0dc834fc88c010baad944d022 SHA-1: 775a7914ec0207dcb43a9bb4195fd6cc1618c4a8 SHA-256: a9d68a996afad32f3913b9e2843e5856536416219fd6f1a0e83b5abd5b90a3cf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/strik?keyword=how+to+read+aeronautical+charts+uk'. The document body also contains this URL, suggesting an attempt to trick users into visiting a potentially harmful site. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=how+to+read+aeronautical+charts+uk
    • https://duxuborokepab.weebly.com/uploads/1/3/4/4/134449965/duzokiwugel_figosufi_wenunobizebu_xoridugudaluta.pdf
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f8fcc7f26c10.pdf
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f941f1adcfdd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0501/8173/4579/files/basilica_of_maxentius_and_constantine_purpose.pdf
    • https://cdn.shopify.com/s/files/1/0496/1989/4425/files/sitios_para_descargar_revistas_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0502/1974/5455/files/wedding_dress_with_cape_and_veil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0826/0258/files/true_love_jennifer_lopez.pdf
    • https://uploads.strikinglycdn.com/files/ef53a13b-c129-4dd3-939b-0a2b72a1a773/86614326454.pdf
    • https://cdn.shopify.com/s/files/1/0498/7981/0206/files/generac_power_washer_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0495/9970/9333/files/ooze_vape_pen_manual.pdf
    • https://cdn.shopify.com/s/files/1/0502/0306/6544/files/duraflex_partial_denture_cost.pdf
    • https://cdn.shopify.com/s/files/1/0498/9635/8044/files/wulem.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_off00006d23.bin
14c8209174bad8355025907a6745f134b2375bf92cbe3d2ca177c386f04aecd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D23 5144 bytes
font_01_sfnt_off00007ea8.bin
a50943c0eb4cdd387ad7983afb3124a8288ebdab4850880cd310ad914c1bf4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA8 10592 bytes