Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cec870ccc1276b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 03:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef814c92a59812dcadb913e434c3e123 SHA-1: 0a9453a48ec0b9f4c39a7f5d85b70cd2089b1c23 SHA-256: 78cec870ccc1276b8e6da4de5be3a06b6609fd7dd3403c63da823ea088243b23
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=ikea+malkolm+chair', is flagged as a malicious redirector. The document also functions as a link farm, directing users to numerous other PDFs hosted on Shopify. This suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment. No scripts were extracted, limiting the analysis of further execution chains.

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=ikea+malkolm+chair
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/41446088187.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/aristotle_metaphysics_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/amines_ncert_solutions_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/bapewe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8020/2905/files/77075493466.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/5561032288.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/79302798208.pdf
    • https://cdn.shopify.com/s/files/1/0440/0896/4246/files/hodder_gcse_biology_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/jexizumoxexutiminawofezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8485/8022/files/50292061597.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/anestesia_epidural_efectos_secundarios.pdf
    • https://cdn.shopify.com/s/files/1/0457/8983/9516/files/basic_addition_worksheets_for_kindergarten.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056fb.bin
ba3f65e5aedccc924b06df185456374ac8fe24658a208dbc785741deafc44f48
pdf-font-stream PDF embedded font (sfnt) at offset 0x56FB 4464 bytes
font_01_sfnt_off0000660f.bin
6075e1041f6453babcbabca633167b125f4f40dd6274d3bcab787ac61527969a
pdf-font-stream PDF embedded font (sfnt) at offset 0x660F 10008 bytes
font_02_sfnt_off0000884f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 4324 bytes