Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8bac14521736cc…

MALICIOUS

PDF

49.8 KB Created: 2020-08-28 22:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8436cd5178010a20d559f4ec2c9dde03 SHA-1: e5d5dd4ddd5d9223f02e6be57600f0832c733a3e SHA-256: 5d8bac14521736cc644d005ab1dfd463d7b9ad4d59382dc98b414a1a85f22753
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a vacuum cleaner advertisement and a URL that appears to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence.

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=shark+rotator+professional+lift-+away+vacuum
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_44cef91b3e7e4b7b847f258b7b565b86.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ba846b4025f45488450396b5fc21405.pdf
    • https://static.usrfiles.com/ugd/b8c837_af2a928ca80a46f1a13767b78b44bd9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d6882410fd848d0a33e1b415cfd021a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c007166d0c1f478d9e6c4c4778f2723f.pdf
    • https://static.usrfiles.com/ugd/b8c837_01c0d35c53b741568e686c0c6e08911c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a36d9949354433ca8684a5763695c9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69efc7993d64722bb3375252cf638f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e26aba2fe3248e48108a57d43fa3a8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_be15e82486eb4077ada1821a06a4844a.pdf
    • https://static.usrfiles.com/ugd/b8c837_12b032929c1c4d90a34db89513d70f04.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdf
    • https://static.usrfiles.com/ugd/b8c837_98b8e68f9a124837b2e32dd7f6625552.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074a5.bin
9ed3d05efee7e134b35ca69468e81a1e7b6447f6273bd011b0ba37f0df21084c
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 5588 bytes
font_01_sfnt_off0000879f.bin
48408427960d672464e9f2c724c6d7f89f989fc75643f447c93becff2f8bad46
pdf-font-stream PDF embedded font (sfnt) at offset 0x879F 10748 bytes
font_02_sfnt_off0000ac6b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6B 4324 bytes