Malicious PDF — malware analysis report

Static analysis result for SHA-256 82552503ccfd48f2…

MALICIOUS

PDF

72.4 KB Created: 2020-09-01 08:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddb69f5fbc750a78c79697e252009d31 SHA-1: 01c611dd750c72c950d2f2c72980f7707778ae0a SHA-256: 82552503ccfd48f29e53433897d2f8157c1be31874ae91551043b09262b663e9
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL which is likely intended to trick the user into clicking it. 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.ru/wix?keyword=hepatitis+b+easl+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9b33c5_a02aeeeea64e42278063c341ff72a985.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_3a85b13afd78467abd483dc049af8755.pdf
    • https://static.usrfiles.com/ugd/06497e_df4b1a4805144ad5937430ab044e8811.pdf
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/tenacious_d_pick_of_destiny_movie.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/13528629278.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/canon_mg3600_printer_driver.pdf
    • https://cdn.shopify.com/s/files/1/0463/1858/3973/files/suvimibid.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/kukobafoziwexoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/assembler_et_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1121/0398/files/xasefanupawokogo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/22934354525.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/1908/3677/files/jibifipazugojixiriv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/66407879660.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_off0000e05d.bin
f15533a34fa356b00e822b0bde61649d6ffc05241b7d13b961c06fa0fbfca4ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5132 bytes
font_01_sfnt_off0000f1d7.bin
d01169819bfc94e9d9fd0c8233dd3359ab9bd8aea2aeda5526e68c28462c0283
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10196 bytes