Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a13f20b0dc4c30…

MALICIOUS

PDF

43.1 KB Created: 2020-09-03 05:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06db96af2764346fe2d21369596baaa0 SHA-1: 785192a24193f0cbd624ceb651ea886654273e5f SHA-256: 18a13f20b0dc4c308dd072170e36979eb8807d3ac39501d0fb02ce60e6131a79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL is associated with malicious activity, suggesting an attempt to lead users to a malicious site. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, reinforcing the link farm tactic.

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=oxford+medical+dictionary+apk+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/52b593_2d7592ee93f642529f74c47d05631cab.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ccba908413f4b75b4dbe3ec35274bd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7b99b6464864c338379f84ed86d63f1.pdf
    • https://static.usrfiles.com/ugd/8127dd_30f59a17598e4992903c535ad7f3118d.pdf
    • https://static.usrfiles.com/ugd/bfbc46_e83ec796378b4ec1b77ac9600c6f7ce1.pdf
    • https://static.usrfiles.com/ugd/b8c837_725656b0a7a34cee9ba910416be135d2.pdf
    • https://static.usrfiles.com/ugd/e02969_00e2432b4f1c480fb894f74b43bbe8d3.pdf
    • https://static.usrfiles.com/ugd/8b2c09_a80c8fecabeb464f98823c2e4461a455.pdf
    • https://static.usrfiles.com/ugd/b0cd75_dfe17a46e8884200b796397711c5a343.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_9b162ce7070d4614b51f1549d82b029d.pdf
    • https://cdn.shopify.com/s/files/1/0432/9062/4158/files/36239487890.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/65965925632.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/14069165721.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_off00005e39.bin
aa1e9488dc239b05b9cfe31bfeeb9da1092061f79fe4415097927ce4c6010fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E39 5172 bytes
font_01_sfnt_off00006fbf.bin
d072aca11dbfa6216f5302ec6a8ceeab7969f683172a07d98bc4f124abd71129
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBF 9996 bytes
font_02_sfnt_off000091a7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A7 4324 bytes