Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f343c603aa1c102…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaeef6e4d52822fabf836ac869b9459a SHA-1: 7416879951e7c1e74ca4e8fe049cf8131380f0a0 SHA-256: 6f343c603aa1c102d50a2d83e6de44617c03a3a5eaee7fce2d036e3137cb611f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=alico+new+guide+mountaineering+hiking+boots+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7e0eb0_4e6a0ef00c3344d78b9f26cda9bec1fc.pdf
    • https://static.usrfiles.com/ugd/9ec29b_75bcf09dea20401da347e336bc130d03.pdf
    • https://static.usrfiles.com/ugd/9b33c5_6da92d4476db40168854ee3ce2e72d16.pdf
    • https://static.usrfiles.com/ugd/e3325f_de8fefd742f34efd990fc9df3d6c8bac.pdf
    • https://static.usrfiles.com/ugd/efb3f0_f89cc215b96e4bff9fb4a8705824480f.pdf
    • https://static.usrfiles.com/ugd/d01287_a1c54498b1bb4d0589bd0fd4fde87265.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/3000_questions_about_me_barnes_and_n.pdf
    • https://cdn.shopify.com/s/files/1/0454/6196/2910/files/57693570281.pdf
    • https://cdn.shopify.com/s/files/1/0440/8927/8616/files/best_self_journal_no_watermark.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/buffer_overflow_explained.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006668.bin
bce9b87ac2662d49cf883561630e0b048e0a699d6e9333aea4b7eafa06109d25
pdf-font-stream PDF embedded font (sfnt) at offset 0x6668 5696 bytes
font_01_sfnt_off0000799d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x799D 1800 bytes
font_02_sfnt_off0000822a.bin
9f8da5a1ece0cb215c036a13ce0819009b5f2abaf60565b412c0aef313edf9b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x822A 10460 bytes