Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51090b0d65a1795…

MALICIOUS

PDF

35.5 KB Created: 2020-08-31 05:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0f7466e79a9845f4c88efb7128e506e SHA-1: ae9c9a52d0dc92c99febfe74dbd8d3f98e2f2b46 SHA-256: a51090b0d65a17955f5eeb001699d11dea7bab4fbe4bc0c9d68c0001b8bcfc94
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to lure users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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=math+1201+brooklyn+college
    • https://static.usrfiles.com/ugd/0c8cc8_d312a40c902e451fa3a14cb5b5e2bd3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a137896d67c4e77980d30d20b4a3800.pdf
    • https://static.usrfiles.com/ugd/b8c837_98cd7f61adbf4dd3a33e90340b305af8.pdf
    • https://static.usrfiles.com/ugd/affb4a_f4f0f42959be45558293c0d2535c744a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ba1575a95e042ae8e625d3dd533067c.pdf
    • https://static.usrfiles.com/ugd/d4da64_f984e5d7018b4e949d1e82ce64875fcb.pdf
    • https://static.usrfiles.com/ugd/ddb60a_5bdf1935b68144ed92f59465282b80fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e05996274a114557ba240fe8438ab133.pdf
    • https://static.usrfiles.com/ugd/4bb894_5fa2fd267c8c4afa818b8fd59165070c.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/wozoxoni.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6893/files/xanenuwobonavopoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6435/files/pozuxuladivotuzupupagamat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/77363372280.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/kinodanamir.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/bd_diesel_performance_products.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_off00004d76.bin
d73ad6e7702897c23374d065002cebcafd836df7d1ac2ce620becfd86b40aac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D76 5520 bytes
font_01_sfnt_off00006050.bin
b209d4a0e4621284f05f40050dbe213ce7aea07b657272428410e35bad94b4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 9684 bytes