Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9f68ab6e2f8c7c…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 13:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e17f486ee547435a3c7dee49f4970409 SHA-1: b15b09f7928a0dd817967d5694e44748488fbf99 SHA-256: de9f68ab6e2f8c7c266c49744a1527ab120e230a809e52c4e0980e2d2d3aea51
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine rankings. One of these links, https://ttraff.me/wix?keyword=casa+jonte+repuestos+daewoo, points to a known malicious redirector. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a vehicle for distributing malicious links.

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.me/wix?keyword=casa+jonte+repuestos+daewoo
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/13171451746.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/ge_9100c_nxt_anesthesia_machine_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/tetidalemawofixogo.pdf
    • https://static.usrfiles.com/ugd/b8c837_681d5d5fb3eb4682a5c791d1f1f60db0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a5744a1b30e48a28ca4e771fb670019.pdf
    • https://static.usrfiles.com/ugd/b8c837_a182443aa60d49d9aceba2fbf9fcfffd.pdf
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/25792517346.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/72243531073.pdf
    • https://static.usrfiles.com/ugd/b8c837_8195b199f5f944f8bde9ad8f53cfa088.pdf
    • https://static.usrfiles.com/ugd/9e41f0_0b6423b60165423a803f1f7a6ebd662c.pdf
    • https://static.usrfiles.com/ugd/b8c837_27b9f03b846f48aaba7ca3a38fd34522.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006326.bin
42a063a675a1cee13c09bf456f66c6390aa74181701852e747044219f97b89c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 4996 bytes
font_01_sfnt_off00007439.bin
c8e0ecc9e49c84bef11b74a937ec518ccb9bc96f192556bd4373a05cf7c5f47f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 3860 bytes
font_02_sfnt_off0000837f.bin
96376ac34e6c42acfd4c7150811c0b6d84b679471cb31efafcc3b98e688e4924
pdf-font-stream PDF embedded font (sfnt) at offset 0x837F 11400 bytes