Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d5e2dd74da0d5f…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 06:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93ac271a0ff95f5bd74c65459bc2a1b SHA-1: 362f6e3d41e34e934916aa7f590ccac8db758db1 SHA-256: 29d5e2dd74da0d5f86267f017ed4cb7a0a8b8ce4857534e975c7005b1927c5cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, forming a link farm. One of these links, 'https://ttraff.com/wix?keyword=gorillaz+humanz+torrent', is identified as a malicious redirector. The document's purpose appears to be to lure users into clicking these links, which likely lead to phishing sites or malware downloads. The ML classifier strongly supports the malicious nature of this PDF.

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=gorillaz+humanz+torrent
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/noromizofaxawu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/zudokazirilawuni.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/tutunasepomazasaweso.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/romantismo_no_brasil_prosa.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d2c6123146c4d618dc198f64f0fa3c5.pdf
    • https://static.usrfiles.com/ugd/f65518_7e01fce240c8406998c048064c1a8238.pdf
    • https://static.usrfiles.com/ugd/0049ca_49b6e3917d044e2298704d72d58338cc.pdf
    • https://static.usrfiles.com/ugd/2f07a1_470acd4eea08444f815f8118f241280b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bde90f7483ef46718d6fc682b1c3613f.pdf
    • https://static.usrfiles.com/ugd/625844_d27cbe9e89d14d6397b65ea72f371b34.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/rowe_ami_jukebox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/pigumuwesegofir.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e96.bin
7fac70b72cdd0be9fd50b02cf47532f578b818c95df5258db52593683bf1aa3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 4828 bytes
font_01_sfnt_off00006ee2.bin
eaa6a38720022fb37843ddbbd761757d5ad9805d131c9eaf073847074eaeed6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE2 10104 bytes