Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff2f3e46444f8f2…

MALICIOUS

PDF

41.2 KB Created: 2020-08-14 23:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 359f504d07395db6f6372e387ae4f297 SHA-1: 50193c9c016dba98098bc049108f3c22c5ac430f SHA-256: fff2f3e46444f8f2671b5721b55b86d897552f1def085dc9458fccaf9dbbb3dc
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.ru/pify?keyword=excel+vba+activesheet.+cells.+paste', is designed to redirect the user to potentially harmful content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to manipulate search engine results or distribute malicious links broadly. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=excel+vba+activesheet.+cells.+paste
    • http://files.uxdesignbyck.com/uploads/1/3/1/4/131437699/gipixefilixop.pdf
    • http://files.pimaboutique.com/uploads/1/3/0/8/130814284/c4998b0d9.pdf
    • http://files.nataliekimballfitness.com/uploads/1/3/2/7/132740277/linuzakazusojowire.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/fowugabatetuwume.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/fowibonavegok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8119/3885/files/zexanilaxuwan.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/jiviforemojuwedib.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/free_individual_development_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/16134339265.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0039/files/back_pain_exercises_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/tim_roughgarden_algorithms_illuminated.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/content_strategy_plan_template.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/
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/fr

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625f.bin
71470e3fb36108e35789224538497e01ed20f5c87803119c9a2623774546cfd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 5184 bytes
font_01_sfnt_off00007401.bin
242b162d7d3384289344a65f87b60c19b479ea5b7f6effe50457cef22e58844b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7401 10568 bytes