Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef48cbefc0d9e46…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 04:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69df7b9fbaa8f6a3cd7cc1082fec7bf SHA-1: 97a4903745ddb5a5806a70afa45299adbbac0808 SHA-256: 5ef48cbefc0d9e4636dd489174a6c362ca2fc22adb529deed0123f0b687f4f45
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=flashlight+jessie+j+mp3'. The document body, though heavily obfuscated, also contains this URL and other links to PDF files, suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect 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.ru/wix?keyword=flashlight+jessie+j+mp3
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c1615c_34dfcd3dda43474abe2bc1be1b23bfcf.pdf
    • https://static.usrfiles.com/ugd/5ad03d_e025a2bfd36f426e9442a90f7c125aa9.pdf
    • https://static.usrfiles.com/ugd/b8c837_add5c080a3664950809aec2effd32aa5.pdf
    • https://static.usrfiles.com/ugd/b48b60_6986f2dfad734eff819c57d8134dea18.pdf
    • https://static.usrfiles.com/ugd/cc14e4_aa879b1dfdb64d8eaed196a08ee3766c.pdf
    • https://static.usrfiles.com/ugd/ae059d_a65561cc9442460d8f26a2645a6e24f1.pdf
    • https://static.usrfiles.com/ugd/a1fb72_0c5c8f040a0e4d49babe3fcaa9eed6c1.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_806dcf46c3a94c58b25fa3a6c7af09b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_04575e3c877248a19f699182ba6cc4b2.pdf
    • https://static.usrfiles.com/ugd/b65acf_b6f4452acbde46cf9e26df9eda0cd3fd.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/oxford_advanced_learner_s_dictionary_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/96475470181.pdf
    • https://cdn.shopify.com/s/files/1/0447/0787/2921/files/arsene_lupin_contre_sherlock_holmes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/wojebujajoxiromalovomapef.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_off00005846.bin
c4ad271a698181786e7188fc58f0e775f42b2af062352708591455a46617259e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5846 5332 bytes
font_01_sfnt_off00006a54.bin
64ff3d00ba2c108ae9082dc774d4b4f8d938bf2e99a8f83c849e1fb2ce04b935
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 14032 bytes