Malicious PDF — malware analysis report

Static analysis result for SHA-256 c783e73c8fb19dc4…

MALICIOUS

PDF

32.9 KB Created: 2020-08-30 05:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e5071f54c73ebac6579d8c61d71d75 SHA-1: e57e69cede873ff83123fa9e7acf5c551dea55df SHA-256: c783e73c8fb19dc4afa2edb9a3eaef3214ccb2acc84ec0eada50d3b802082587
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Wurst hacked client 1.8.9' and a URL that aligns with the malicious redirector. This suggests a social engineering attack aiming to trick the user into visiting a malicious site, likely for malware distribution or credential harvesting.

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/wix?keyword=wurst+hacked+client+1.8.9
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/craftsman_chainsaw_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0436/7374/7609/files/61175049257.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/1120692445.pdf
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/95582586498.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/make_string_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/econnect._osfhealthcare._org_s.pdf
    • https://cdn.shopify.com/s/files/1/0459/2648/2071/files/19821868910.pdf
    • https://cdn.shopify.com/s/files/1/0435/9133/6099/files/tawozibekirotiwirubanire.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/94459960272.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/detofired.pdf
    • https://cdn.shopify.com/s/files/1/0438/5076/0357/files/best_to_word_conversion_software.pdf
    • https://cdn.shopify.com/s/files/1/0435/6715/3313/files/kazejabajolimunedux.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_off000042e2.bin
9a845f17072a9183e2d91bd5fe94198c996990a50061583dac29fd1f0bb977d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x42E2 5540 bytes
font_01_sfnt_off000055bd.bin
14d5cc7a33d39ed3314a0c016d24685f4e771c31ef00211151c3bb584e9966d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x55BD 9756 bytes