Malicious PDF — malware analysis report

Static analysis result for SHA-256 625471753d4bd5ad…

MALICIOUS

PDF

43.1 KB Created: 2020-08-15 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4048b16e2253b388a02a652c7c9db74b SHA-1: ed188dd49d3dc508a3e4f680941c142b3da1f8ea SHA-256: 625471753d4bd5ad8ade881f3fb617e771795eb5cc81b95a700f01fa4f604ad7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to the malicious URL.

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/wb?keyword=neoliberalismo%20en%20honduras%20pdf
    • http://files.bekindbeyou.com/uploads/1/3/0/7/130740357/8682833.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/types_of_management_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0035/6251/files/79423684844.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/45383660319.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2860038855.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/rekotofovodes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5653/files/rukelovijinuxamepasem.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/5e_ring_of_warmth.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/muberexizovox.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/85084948440.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/80940286738.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/piridakujogukalulam.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_off00006749.bin
c6f8e5154a00f952776e4278f7e5aa57256edd156033d357794451a4e58ddb51
pdf-font-stream PDF embedded font (sfnt) at offset 0x6749 5392 bytes
font_01_sfnt_off00007964.bin
00ef9df171380263a83d3a658955f9ba3b4be3655e38766ad006a8a729215d40
pdf-font-stream PDF embedded font (sfnt) at offset 0x7964 11280 bytes