Malicious PDF — malware analysis report

Static analysis result for SHA-256 656e34c676c62778…

MALICIOUS

PDF

52.5 KB Created: 2020-08-25 22:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db828a1ab2a1f432d39110f5f1fc8df0 SHA-1: 48573721dd8ee3d2d8b9b56d594c2bde9e43a3b1 SHA-256: 656e34c676c627786e73c618ee4a051fc03a83d3c67b8e002d5d54876efa33f3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.me, which is likely the primary malicious objective. The ML classifier strongly supports the malicious nature of this PDF.

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.me/pify?keyword=karasu+yu+yu+hakusho
    • http://files.hombomtoys.net/uploads/1/3/1/0/131071063/362155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/99303116571.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/bounded_set.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/uu_hak_asasi_manusia.pdf
    • https://cdn.shopify.com/s/files/1/0434/7350/2361/files/waponosoramuvat.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/sfchronicle_voter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/20732130505.pdf
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/evaluating_algebraic_expressions_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/5296/3742/files/39297747354.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/77660543844.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_off00007655.bin
cbdb95ed5db75473fc8f1503385adf542197f9a81e568441871fa5fe87be971c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 8204 bytes
font_01_sfnt_off0000920b.bin
8a8c32b77d8cdfffe155ef0a1dec2c1b184b3e971144b69a813802eb942d40e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x920B 4876 bytes
font_02_sfnt_off0000a2a1.bin
d667c7e6dd8ce7c8d034214f89c17c535085e5f3f34ff34394b9d07b0402b014
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A1 10236 bytes