Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde57567cdde08a2…

MALICIOUS

PDF

122.3 KB Created: 2020-08-06 07:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eae02299206049aff26a946e6e7931b SHA-1: a9be133178a96a6eefb425ea34acddd47b47fb65 SHA-256: fde57567cdde08a2ee2a3f1cd9ae311c6d3792a2b365476c2799320fe1dfc67b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of multiple embedded links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=alapt%25C3%25B6rv%25C3%25A9ny+2020+pdf
    • http://files.nerdinout.com/uploads/1/3/1/1/131164260/5444081.pdf
    • http://files.cybersecurityinc.net/uploads/1/3/2/6/132681938/natuwafegaga.pdf
    • http://files.dugonipdb.com/uploads/1/3/2/8/132815220/tugiwi.pdf
    • http://netipa.leehanson.net/uploads/1/3/0/7/130776407/7ef580e.pdf
    • http://files.healingwithjeannette.com/uploads/1/3/1/6/131636827/fatewew_rinepubarokame_tegujirek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/72130613205.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6771/files/9405692144.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/15512900786.pdf
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/periodic_table_coloring_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7637/files/enteric_fever_in_child.pdf
    • https://cdn.shopify.com/s/files/1/0433/7257/6922/files/1870391246.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/ditolorosudigivufedekod.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/renemuriloke.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/33740575820.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/kudonakum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001957d.bin
058316cbe715da5eb77db6632443179d5ba22de815dd532e6630c98b21b94d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1957D 5072 bytes
font_01_sfnt_off0001a6da.bin
9c4ff43d9f364a6186cb47e4337dcbfada901bcb1ef784b5c46939de7e8b6e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6DA 11756 bytes
font_02_sfnt_off0001cb9a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB9A 4324 bytes

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