Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a534777cbef000e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 14:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1528b7ed3f1d7091a9f268c1e88c7bc SHA-1: da7f6b31a195861131707a72676c6c2c75724ec9 SHA-256: 5a534777cbef000ec87d4f14c91e3d02dbaa68a5d49ab390d0d81bb8e4806607
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 of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=stainless+steel+square+bar+sizes+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. No scripts were extracted, but the presence of numerous external links and a malicious redirector strongly indicates a phishing or redirection attack.

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/pify?keyword=stainless+steel+square+bar+sizes+pdf
    • http://files.bengonzalez.com/uploads/1/3/1/6/131606636/6252550.pdf
    • http://files.andrewatkins.org/uploads/1/3/1/8/131858916/4836997.pdf
    • http://files.relianceservicesllc.com/uploads/1/3/2/6/132696104/5a0f0d3688bd0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/she_s_got_the_look.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/nujuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sividejujim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/12228886766.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/88410597588.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/77721282563.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3764/files/vsd_to_converter.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/wudefixariwagadabazeked.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/29850141089.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_off000065be.bin
257a3377ec66077e84e40b6220e9d7510835013b57bf7b5574b6dfcc0c28951a
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5456 bytes
font_01_sfnt_off00007849.bin
4fe77453a2eb75d301ea6fd8d937001a75d89af1d2fca14441a448715f6a796c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7849 10452 bytes