Malicious PDF — malware analysis report

Static analysis result for SHA-256 0798bf78c1c919cd…

MALICIOUS

PDF

42.5 KB Created: 2020-09-02 03:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4db321e1de8c2cc423378e7d63ef85b SHA-1: 0d45f583b3d956c8b7405ae10022de5170626020 SHA-256: 0798bf78c1c919cd58c6e4442cf2408b766ca1d99393bb439dfd7a9a32a99559
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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.com/wix?keyword=business+communication+journal+articles+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/anari_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/pidemosadugamimex.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/jukubavipin.pdf
    • https://cdn.shopify.com/s/files/1/0459/5951/2223/files/97880953030.pdf
    • https://cdn.shopify.com/s/files/1/0465/0821/2374/files/wadanazuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7795/0870/files/gopigibogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/kundalini_shakti_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4405/files/92780930646.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9238/files/hbs_management_consulting_club_case_interview_guide.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_4fecaaf5105d406ba678e2cd4c46a166.pdf
    • https://static.usrfiles.com/ugd/5438e3_b8ca1c6942b64cb19f5ee961f513c105.pdf
    • https://static.usrfiles.com/ugd/9f69bd_ad9152d0e80d4b4a97ef724854b9e91b.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/64874400840.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/morphology_of_african_languages.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5088/files/25897916108.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_off00006624.bin
e56967018bd2bc00fa2495cc62fd7ad62d40a3f3fd7fb700680a291624d22257
pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 5428 bytes
font_01_sfnt_off00007887.bin
10d8fd5a2a2e8a30f67807efd215c471bc5c6510cf363861d870b046d396a775
pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 10724 bytes