Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c59f9893915118…

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 18:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371c4d66ae5a8a4ae05071bae98b0fe4 SHA-1: 6b554ad61e2487290460def5f6084aafe7cf85bc SHA-256: 51c59f989391511847e5327b5239119a6fee1f419461f5c179ac98381553e9c4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a high number of embedded links, characteristic of a link farm. One of these links, https://ttraff.cc/wix?keyword=pythagoras+rule+calculator, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to external content. The primary attack pattern involves redirecting users to malicious infrastructure, likely for phishing or malware distribution.

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=pythagoras+rule+calculator
    • https://cdn.shopify.com/s/files/1/0435/1878/7736/files/wuwubirilonoxosixidanizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/53788027370.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/dafuxetowoluxabuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/wevulavadoxoluxusit.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/84770167159.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/giwozaropefip.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/dukoni.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbef19994c02481a98afd43b7786c9c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_013be2fdc21c4e9b97afb638a87075e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_06726444992e4d47ac4fef5d33b314e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1eb19ebe98084798a5388d3372aada1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0d0913464c447e8d33514485477726.pdf
    • https://static.usrfiles.com/ugd/22739b_4146bfb0067e400bbaaeec42cefe0f76.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a24.bin
358af339093f64b58f00b92b0e46fca4a78167ed6d90c8fd6c1e4d3073fd0dea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A24 5164 bytes
font_01_sfnt_off00006bad.bin
13c162a31614fda99e740ecbe630860f3791791f4e15bd9853a42ea50a4e07a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAD 10604 bytes