Malicious PDF — malware analysis report

Static analysis result for SHA-256 8670de32adebf843…

MALICIOUS

PDF

40.4 KB Created: 2020-09-02 13:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cacd0cfd5950a140e55d327c07b6ddf7 SHA-1: b31f1a507d9479d6ad1d15ddf4866ac5e9151e31 SHA-256: 8670de32adebf843036a0f7c51ac279e873490427807632a298ea3fe29796289
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains. One of the primary links, https://ttraff.cc/wix?keyword=aplicativo+para+ouvir+musica+offline+gratis+android, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

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=aplicativo+para+ouvir+musica+offline+gratis+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/bluestacks_ad_skipper.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/48815941012.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/bottom_ash_handling_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/74699579548.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/glitter_acrylic_sheets_uk.pdf
    • https://static.usrfiles.com/ugd/b8c837_6284ee5ef7f74cc293fa6d99cbb42d45.pdf
    • https://static.usrfiles.com/ugd/b8c837_a95941689db5425b9f4a0dd5103113fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c7cd9e7fb84697a096215b1eac9c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_250df11c763146efbeef2624cb81716c.pdf
    • https://static.usrfiles.com/ugd/b8c837_74fc5a1685cb45c594a89ea55cf96e93.pdf
    • https://static.usrfiles.com/ugd/c162b3_d3aa3a2ecc8e40dab4dec769de80ac93.pdf
    • https://static.usrfiles.com/ugd/c33cdb_bf46655d4776467ca7c1e47d2d213163.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_off00005ebe.bin
b5f4e50e8df3b6988d24a52685c7b804621ad405d37944ce773a356c827da723
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBE 5524 bytes
font_01_sfnt_off0000717b.bin
49ad7ae000d5410ee24116d99888819a79bc10ee3131788bc53d5b1115316cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x717B 10364 bytes