Malicious PDF — malware analysis report

Static analysis result for SHA-256 32861df10a72b193…

MALICIOUS

PDF

41.1 KB Created: 2020-08-18 15:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf14f4fedee383ef69a8bfd20bc16c07 SHA-1: b4488aa1adfb0a8d4c88c6dfe8bde802e583b703 SHA-256: 32861df10a72b193cfaffd172f2f8c1f92e1ee3d43fc5de930c34dea6d12ebc3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=heart+disease+types+pdf', is designed to redirect users to malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious destination. The ML classifier strongly supports the malicious verdict.

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=heart+disease+types+pdf
    • http://lirebej.oilmyworld.net/uploads/1/3/0/7/130776644/kubotilewijeval_bodoluzegimesi_fanujabujeka_jetaxuxuxovasuz.pdf
    • http://files.nbhsffa.com/uploads/1/3/0/8/130815664/b350a7.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/vmware_esxi_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/mother_s_day_writing_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7527/files/xajuw.pdf
    • https://cdn.shopify.com/s/files/1/0439/9002/4350/files/holistic_approach_in_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/51607351299.pdf
    • https://cdn.shopify.com/s/files/1/0447/1911/2345/files/acidic_foods_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/wgr614_v_9.pdf
    • https://cdn.shopify.com/s/files/1/0429/6428/7651/files/87736883356.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/lebemomewasusuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/piresevogoporigodufonux.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/jaketerilupaniko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/73934485481.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_off00006531.bin
d6b3569ea1b88a00059dce4ad8e72df8047c235e444dac96bd287011f3d1193f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6531 5064 bytes
font_01_sfnt_off0000767f.bin
f046299689b9d778440e52a83221953ef1d3ee23cd94580a20cf66e5241d0fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x767F 9872 bytes