Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de40c9fcb4ba3b1…

MALICIOUS

PDF

58.0 KB Created: 2020-08-31 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42968ce207c23b04fd88c26d0680c301 SHA-1: 3f5014da2bc1f0f7cd5f6e096941e0584675e3a0 SHA-256: 0de40c9fcb4ba3b17f32c6a3a8443c3fa19a3908a1a80a1b21a9bde5e43d8c8b
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting urgency and includes the malicious URL. 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 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=sinusitis+guidelines+2017
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1e3d2afce0414796b97d8b1b9369c023.pdf
    • https://static.usrfiles.com/ugd/86319b_574961bf12fa4dcaa58fbd7e1e1243c3.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_67adfd663bd94fb98696717f93f80767.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/94111160753.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/annotate_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/dutetego.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/another_name_for_the_word_guidelines.pdf
    • https://static.usrfiles.com/ugd/3dd68e_f625f6a7e3b54b1c89d00f2c2fa0d67b.pdf
    • https://static.usrfiles.com/ugd/e73fea_c0bdd1fb332147c79d853472be1fbbbc.pdf
    • https://static.usrfiles.com/ugd/0c4177_f8a4bbe6c6bc45d79d1459abec5e319c.pdf
    • https://static.usrfiles.com/ugd/0a0016_578629c7c4554e90ba76c0df67dbf747.pdf
    • https://static.usrfiles.com/ugd/b8c837_701b8985ac11465f8bac312c70df71e6.pdf
    • https://static.usrfiles.com/ugd/4725f1_583f0d4f33f849b49cbc08a471876924.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_off00009c84.bin
4f11e5914a1dca5a1bb7a3312d183d6c934d1ad3a6c4acb04a224787989e738f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C84 5196 bytes
font_01_sfnt_off0000ae53.bin
1878ec2bd3c2fc5c986df891005b580372e7dc0b20faf2e6747a411f8e23a14b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE53 14156 bytes