Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a46f9f2545e586c…

MALICIOUS

PDF

45.4 KB Created: 2020-10-31 13:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad851f1b02f260768dbe6c7b496b7198 SHA-1: 5f938c940758c54f7b4660b7f66c769fb57ee4a6 SHA-256: 3a46f9f2545e586c5cd4c0b20d20616a2d34dce886dd51d407ff309207fc5daf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm within the document to direct users to external, potentially harmful, websites.

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/aws?keyword=dutch+lap+vinyl+siding+vs+clapboard
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f8a1dd6c0b8c.pdf
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f8bcfffc4c86.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5f951df3eb3ce.pdf
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f8e8751e56ae.pdf
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f90747083f50.pdf
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5f9891db7e43f.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f87049f77f74.pdf
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8a3dc87b4af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0483/8965/2648/files/95999306684.pdf
    • https://s3.amazonaws.com/babetafaperaxov/cardiac_heart_failure.pdf
    • https://cdn.shopify.com/s/files/1/0499/0173/2039/files/manonobofetot.pdf
    • https://cdn.shopify.com/s/files/1/0268/8755/3213/files/xarivi.pdf
    • https://cdn.shopify.com/s/files/1/0266/9481/1819/files/natalia_ginzburg_caro_michele.pdf
    • https://cdn.shopify.com/s/files/1/0504/6419/4720/files/dale_dubin_ekg.pdf
    • https://cdn.shopify.com/s/files/1/0502/7155/1656/files/kaliti.pdf
    • https://cdn.shopify.com/s/files/1/0485/1335/1835/files/mkv_supported_video_player_for_android.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_off0000721c.bin
28a5052d151a1f2b23fcb8b9c2d3a53d0717241a498ea6facab85f715340f7b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x721C 5636 bytes
font_01_sfnt_off0000854f.bin
034950e940a72e1f349c021fafcb4cd2951864ebc54169b205dc4351df44396f
pdf-font-stream PDF embedded font (sfnt) at offset 0x854F 10448 bytes