Malicious PDF — malware analysis report

Static analysis result for SHA-256 15440a224cea6bec…

MALICIOUS

PDF

43.4 KB Created: 2020-09-10 20:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4683771052f6f917d5b0057a733bd07 SHA-1: 1f12bf8699029a4f7f9d85b08b6ab699deeea082 SHA-256: 15440a224cea6bec726efdcdbf4b1e7d5442357ca26aacf6cc4be9d0152a4cb0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is used to drive traffic to malicious infrastructure.

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.club/wix?keyword=vegetable+lasagne+with+butternut+squash+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/pofanatevibasepisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/vuxafaxapesagow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/narod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8674/1655/files/85739253958.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_a04eebedf58f426c8c30e8585fa46b13.pdf
    • https://static.usrfiles.com/ugd/5b9365_0271100c97984758b9cddcdac0b054fc.pdf
    • https://static.usrfiles.com/ugd/4c1554_a25a56a3c30e4390b37b7388f357633f.pdf
    • https://static.usrfiles.com/ugd/e80f4c_658d4bc2092b4e09b7c823f75da71d46.pdf
    • https://static.usrfiles.com/ugd/b8c837_3feab1d4884540a9aa308b41debaf98c.pdf
    • https://static.usrfiles.com/ugd/24853a_88f7a5060dfe4860a45b942a9953dd3b.pdf
    • https://static.usrfiles.com/ugd/4b874d_594533fb18a84f0bb42463be2c5c599b.pdf
    • https://static.usrfiles.com/ugd/e3834b_ec1e0b1959e34e2da478a7f904c071b1.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_off00006b0f.bin
0e36bffcf137bb152b7e15894dbb9162505468beed1fdf2b75365f24828f10db
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 5268 bytes
font_01_sfnt_off00007d08.bin
803ce490d8fc43676c8e5a686d5b3c3a651b06751a42af74d13f88fc45984f55
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D08 10444 bytes