Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b1bca6ee7bb27…

MALICIOUS

PDF

45.0 KB Created: 2020-09-06 02:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a6724c7497f06afff10f73f863db2a0 SHA-1: 923c2b45d9c92fdd3be45f115571598ebb71ac8b SHA-256: 798b1bca6ee7bb2768f65d6a846bba4ac9822914c1740245e43e047745f1b49a
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically targeting searches related to 'medical equipment'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates the primary URL is a known malicious redirector. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, likely leading to a phishing or malware download site.

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.link/wix?keyword=medical+equipment+and+their+uses+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9cb927_e55f465da38749dab687f097b40840f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ad74317eeaf4f898687327d61875ccd.pdf
    • https://static.usrfiles.com/ugd/07625c_f300c12feb9648fe98588159d01461f8.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_e78c5bc742c1446995320bc8e750a6ea.pdf
    • https://static.usrfiles.com/ugd/b42fd6_ced054fe599d42e0a5560ddb8d69c6f6.pdf
    • https://static.usrfiles.com/ugd/067ecb_1d38ab399ee645ecb7f4a4294fc2fb30.pdf
    • https://static.usrfiles.com/ugd/18122d_a3f8ad7ed8fc44ee8adcfdeeed480a2f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/vojodulotub.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/49212709539.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_off00006464.bin
9736d55ee0eb0c189e9056c55ca868aa826c23329664836376b78e30701de1dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6464 5296 bytes
font_01_sfnt_off00007630.bin
d9071616cf0d4d1f87d1d0312ad7295638b99cc9b725fc36da4a63e6935b0372
pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 10352 bytes
font_02_sfnt_off00009999.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9999 4324 bytes