Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bdf4a7e0dd8d90…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 21:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab67a28dcca109a9d9a1b827c9f6d66e SHA-1: 87f2d8ce705987451f0672b3f8d28780adcbbab8 SHA-256: 79bdf4a7e0dd8d9011df98f72ba5373e8326e9842dfe421135a9ef050735b673
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/wix?keyword=watch+csi+las+vegas+online+free'. The document body, though heavily obfuscated, appears to contain text related to watching content online, likely a lure to encourage clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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=watch+csi+las+vegas+online+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/zetamepap.pdf
    • https://cdn.shopify.com/s/files/1/0452/0817/4743/files/83723101085.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/24765299917.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9900ea248a4ee1b9f7bee44bbebd19.pdf
    • https://static.usrfiles.com/ugd/bd5c68_1991cca200704cab88c54cd4bc3f6212.pdf
    • https://static.usrfiles.com/ugd/db1da1_3d3de85a21d7410e9b8261f68489649c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d67ec2f2de2477b96a9c3a4be8db334.pdf
    • https://static.usrfiles.com/ugd/de02f3_9cf2a9448ca44d90bbfdbc7efa6f3ea8.pdf
    • https://static.usrfiles.com/ugd/b8c837_4646e54ddc0649e38460ee08418bcde8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86cc98d60f048a99d863c5b6d6b8d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf7e75be42e84fb39461b4b2bf6d0847.pdf
    • https://static.usrfiles.com/ugd/b8c837_588d24831d0d4f7ca37ccbc5fb22e7ae.pdf
    • https://static.usrfiles.com/ugd/4b874d_46aad64cbc08441eaceee4308d569167.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_off000066f9.bin
229866b82124a209fd7f8561913ddce69b0440397e545c5dab58aa0171ab1504
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F9 5216 bytes
font_01_sfnt_off000078bd.bin
f6de47b06d6c421a37f9d1ec059c694e3717f7c5d8e74f3ff246496152e4b0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BD 10216 bytes