Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82d0919cc4a8b95…

MALICIOUS

PDF

41.8 KB Created: 2020-09-03 07:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22845b721aceca3bbb26c04ca2b70f01 SHA-1: bb35781104586e84b9e8110b979cb8b7d30d29cc SHA-256: a82d0919cc4a8b952d6705aa7398e59ef44f28f9f493aafc386465f8d4344878
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for technical documentation. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL confirms a phishing or social engineering attack pattern.

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.link/wix?keyword=bash+shell+scripting+tutorialspoint+pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/kovonoroji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4102/1334/files/11157946825.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2951/files/asme_section_viii_division_1_appendix_7.pdf
    • https://cdn.shopify.com/s/files/1/0429/7103/7855/files/luxapeje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/wojijulivakenazew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/82172445742.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/tokojasev.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/tananumegoriwazolazejewoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/7992/files/filemaker_pro_advanced_17_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/68930856160.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/viwududa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/vigin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/gubokitikulexa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/jejadamisowefub.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_off00006266.bin
340c9bfddd5b18d6484949a9efdd72da5e7cfb1f5d156d0d03e004cb9840000f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 5468 bytes
font_01_sfnt_off000074fc.bin
2328828793a3c80be935ec4d70fbbc0b26c2786bd43b25fafdb480e4b728642b
pdf-font-stream PDF embedded font (sfnt) at offset 0x74FC 10944 bytes