Malicious PDF — malware analysis report

Static analysis result for SHA-256 e758c64ef9f38c4b…

MALICIOUS

PDF

39.5 KB Created: 2020-08-15 10:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d66e15b1e451ae6279fcb95f0561be2 SHA-1: 9624cd40f83ec465525894f7788338165485895d SHA-256: e758c64ef9f38c4bfb3b23849b83fd6578c2d533b443287c538c2e2f42116af3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector at `ttraff.ru`. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated.

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.ru/wb?keyword=eating%20disorders%20pdf
    • http://files.hopedwellsblog.com/uploads/1/3/1/4/131409709/6817929.pdf
    • http://files.beckiehennessy.com/uploads/1/3/0/7/130740612/9489390.pdf
    • http://files.floridakeysoceangallery.com/uploads/1/3/1/3/131384335/6123659.pdf
    • http://sajamu.humboldtmutualaid.org/uploads/1/3/1/4/131453301/5860628.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/kupujixixilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/teaching_grammar_for_young_learners.pdf
    • https://cdn.shopify.com/s/files/1/0434/0226/4741/files/dudojumuve.pdf
    • https://cdn.shopify.com/s/files/1/0449/5199/4536/files/dusex.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/42675748050.pdf
    • https://cdn.shopify.com/s/files/1/0434/6481/8838/files/59775333841.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/tenogulerunenudinopaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/moluzizenaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/5438081472.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_off00005dbe.bin
6074f553fde05ee6bec38e667a3ffcd63d12d4c84e7e520fc306691b12e1d1c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 5132 bytes
font_01_sfnt_off00006f48.bin
d059ed198658447202def23b664f561f253222ba50a887dd6ffb9f366063e98f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 10060 bytes