Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddf020db4d6d007…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 23:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ccdb36a613428ee5a6f540b74cef57 SHA-1: 9d4c566e1436904f56f4ac8066ff82a4ccbea88b SHA-256: 5ddf020db4d6d0074eb8867586e3e32107a51f46d93cf3e977ce6b03bc9699a4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though obfuscated, contains the same URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the presence of a malicious link farm.

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=assembler+directives+and+operators+of+8086+pdf
    • http://files.thedoghousepetservices.com/uploads/1/3/0/8/130873895/257a01.pdf
    • http://files.jansceramic.com/uploads/1/3/2/7/132740633/xowopa.pdf
    • http://nubopaden.cseventservices.com/uploads/1/3/1/3/131384714/burasej.pdf
    • http://files.tsd401bond.org/uploads/1/3/1/4/131483343/zuvefe_jobominisu_dofosokebuxo_wobumavepati.pdf
    • http://nedazalum.thepinnaclecafe.com/uploads/1/3/0/7/130775376/penaruzafenov_xowopan_fozebebum_zonunevasuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/sopudodiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9317/9030/files/nsw_traffic_accident_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/worksheet_2._2_limits_and_continuity_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/thrombocytes_thrombus_formation.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/descargar_cancionero_cristiano_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/english_grammar_articles_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/8635468650.pdf
    • https://cdn.shopify.com/s/files/1/0440/4045/4294/files/struttura_divina_commedia.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/convert_kindle_to_windows.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_off00005d25.bin
78db39dc29af0d3cfdeeee22eed8a517046bdbe94aed25e6ad219c55207c0a78
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D25 5980 bytes
font_01_sfnt_off0000715f.bin
293aa0edf39bba6405f6e552e725f732b4d95ef429ce6f42cad6cf99e0529c26
pdf-font-stream PDF embedded font (sfnt) at offset 0x715F 10172 bytes