Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897d1c57519f987…

MALICIOUS

PDF

60.8 KB Created: 2020-09-09 21:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 002f2d5d103d91d75a7d1998194a9c21 SHA-1: e8c5140e48db0f7b82772c2be03732d00f6f3539 SHA-256: 6897d1c57519f9871b2a7461c9c1908b2c0cba63652321ce180ecb0582ab72fd
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 identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, suggesting a lure to a malicious 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.com/wb?keyword=definicion%20de%20factores%20sociodemograficos%20pdf
    • http://files.southgeorgiaelitecheer.com/uploads/1/3/1/3/131380177/lijoretos-kovafadaxa.pdf
    • http://files.cebhalifax.com/uploads/1/3/0/7/130740490/6934934.pdf
    • http://wuzuk.frenchbyemilie.com/uploads/1/3/0/9/130969761/1144118.pdf
    • http://files.trentsoyster.com/uploads/1/3/1/3/131381961/ruxiwido.pdf
    • http://zutedalu.ngfmeetings.com/uploads/1/3/1/3/131383297/sufukegiwevupiroje.pdf
    • http://files.ilovemyminischnauzer.com/uploads/1/3/0/7/130738889/nomekuxojinixasu.pdf
    • http://gusupix.eco-logical-resolutions.com/uploads/1/3/2/7/132740405/4873002.pdf
    • http://files.azmendinglives.com/uploads/1/3/1/3/131398487/folijepuzenixusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d875d13cd1e6451d9ac5728e0dbfcc71.pdf
    • https://static.usrfiles.com/ugd/e1d12c_a07d4cce056d42719d89b3edf9dc1fa4.pdf
    • https://static.usrfiles.com/ugd/185c00_50a62744ce58402cb09dbcf0086b749f.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/jorejijeti.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/anonytun_black_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/561286352.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/15047728147.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a61e.bin
cf31f6c381ee854c335c852455754525ffa93978e184b9dcd3b8a2efd7a60949
pdf-font-stream PDF embedded font (sfnt) at offset 0xA61E 5440 bytes
font_01_sfnt_off0000b897.bin
8f8d7477496f4f9f92f5611114490dfeda88a8e8ea90738a29ceb857e9a7816f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB897 13940 bytes