Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8997edb3731f361…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 22:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa1bc41ea9b9710b87327604736c1ed0 SHA-1: 47aed6190786b0da9fbccf2a9cbb69bdaafa2909 SHA-256: b8997edb3731f361682149a54c595f8d1245f16f24931d18577f4c13f722bef6
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.cc/wix?keyword=michael+jordan+the+life+pdf'. This indicates an attempt to redirect the user to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous external links, as flagged by PDF_SEO_LINK_FARM. The ML classifier strongly supports the malicious nature of this PDF.

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=michael+jordan+the+life+pdf
    • https://static.usrfiles.com/ugd/06497e_ad124e2fb872416cbac0b16ae6a69846.pdf
    • https://static.usrfiles.com/ugd/227d0f_eb4237065bc046ffbe5e4fbd53cf857f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9096d5bc6f8d4641a47c47d913564d34.pdf
    • https://static.usrfiles.com/ugd/724fb5_404c47102f844ae1a076626a08535266.pdf
    • https://static.usrfiles.com/ugd/909b15_0c07c6e5363e48c9ae0a74a9697c0d40.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1626/files/libro_aprendizajes_clave_cuarto_grado.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/hpv_vaccine_canadian_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/73460803274.pdf
    • https://cdn.shopify.com/s/files/1/0431/8874/8452/files/kiduretulojugimixewerovep.pdf
    • https://cdn.shopify.com/s/files/1/0448/1817/0018/files/94282392847.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/carnatic_music_senior_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/93832763479.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_off00005eaf.bin
19f74e12990832e17251cac483dd5a4d69a5458fe2896c4abe02c4aceb7ab60d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAF 5144 bytes
font_01_sfnt_off0000702b.bin
6870c57ef96d5c9840b5627f9f374ec52930bb7440287590dcda0c3e50e020ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 10076 bytes