Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bc32098f334fde…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 22:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3520d2b97d434c557a9f533c8fea19a SHA-1: 155d7f1a829739cc52756ceae91a9cb5d2c249b6 SHA-256: 70bc32098f334fdebea3da8f73a685c3ff5615bf7bde88e9d67331fd14a3fe70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Vax w90-ru-b carpet cleaner instructions' and the malicious URL, suggesting a lure to trick users into visiting a potentially harmful site. The presence of numerous other PDF links further indicates a link farm strategy.

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/wix?keyword=vax+w90-ru-b+carpet+cleaner+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0465/3491/8302/files/lcpdfr_call_tow_truck.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/68774797603.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1237/files/86099977785.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/vujotukinuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/xejiberutulefeludezaxug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/display_system_and_anthropometric_data.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9783/files/return_of_the_king.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/pearson_algebra_2_common_core_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0701/files/differential_calculus_for_beginners_joseph_edwards.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/84787054724.pdf
    • https://static.usrfiles.com/ugd/5b9a87_46c4f48393724a2c86c0481423ad5c3e.pdf
    • https://static.usrfiles.com/ugd/be19e1_aab4e8df4b2c4f2fa722621455e72d40.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_off00005a1b.bin
aab73e22a9349fd0eda6ff7244f7ef04a8a317e7d8511510236b9b49412f4fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1B 5524 bytes
font_01_sfnt_off00006d00.bin
512f12a6252bface29014b415de83740264cb59ae8d5ac7fbdd6ebfdde3781c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 10428 bytes