Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ce941142f08f73…

MALICIOUS

PDF

44.2 KB Created: 2020-08-24 07:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e9cafc9e05877bbb6d92db8d09ee910 SHA-1: 6d2dd649792779c1685bde3addc0b916a767a3f6 SHA-256: 42ce941142f08f73d294ba621b5faab47e76510cf294c6a8af6214dff7d5c0f8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as exam papers, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a lure to download further malicious content or visit malicious sites.

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/pify?keyword=general+insurance+agent+exam+question+papers+pdf
    • http://butotori.embcmanning.org/uploads/1/3/0/8/130873830/todagefelesu-nulasaguxox.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/dikitizogogipefel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/tuviwotisikoxajetir.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/xuzomukafitato.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/nuganosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/24055568989.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/70743666479.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/pnb_housing_finance_fd_15g_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/9414/5176/files/bimal_jain_committee_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/97366197102.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/86278545299.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2960/files/relubiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/peboluzib.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/25146576571.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_off000069d8.bin
f556da5b943cf3d5991771fa7bbf55890f99a61c6baecb42cde08dedf7edc004
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D8 5700 bytes
font_01_sfnt_off00007d28.bin
232f62f2f9b2951e07ca5d3c20f48f679fd1245d35442c13fc276a21da3b7c92
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D28 12156 bytes