Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f90f66d8022980…

MALICIOUS

PDF

40.6 KB Created: 2020-09-02 15:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c6a162544957b2547603aee9afdd64 SHA-1: ab441a35965e216ab3fee22ecfe8928c5e5a4462 SHA-256: 63f90f66d80229803c476f8f0eaf6e0703ab35fa30e8c193542e0d787731dde8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'user acceptance testing checklist template' and a URL that redirects to malicious infrastructure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/wix?keyword=user+acceptance+testing+checklist+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/sogefiwujufidezisiwonaduj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/6507315407.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/tnpsc_current_affairs_february_2020_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/5705/1808/files/segment_addition_postulate_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0461/4268/5337/files/business_development_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/melanie_collins_nfl_reporter.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5276/files/60725617313.pdf
    • https://static.usrfiles.com/ugd/850f07_67a3658707f34939b6ccfbd2e189d94b.pdf
    • https://static.usrfiles.com/ugd/4d6844_df9320a9caf649038c51559fd6f3ab09.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b8d0798de2a4789a4b0b27ac73622b5.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/topawegojox.pdf
    • https://cdn.shopify.com/s/files/1/0432/1669/9553/files/dawiwal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/13070951994.pdf
    • https://cdn.shopify.com/s/files/1/0431/2730/8454/files/39200240987.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/vuzaviminubagobi.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_off000060fa.bin
e075a0323321ea99c5c6240f5cac05671da8c570c2ed1fd50e77b9978ac5f6b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x60FA 5404 bytes
font_01_sfnt_off00007334.bin
073549798a3c9a4517dc567f0dd0d3f3514671583f4a7aef2d3476c4e4d3e5a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7334 10112 bytes