Malicious PDF — malware analysis report

Static analysis result for SHA-256 375b2cdf8cc9b0ae…

MALICIOUS

PDF

49.5 KB Created: 2020-07-24 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356c4c752923e0bbf75e64e9c56d2c1b SHA-1: 365060493597d636fe2759a1d9fcfd2ae78f472c SHA-256: 375b2cdf8cc9b0ae45eaafe56024f60b5a4c0e73ec82e9ce837ecbc7e5c7f881
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a link that redirects to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to be a lure related to 'Baltimore ravens injury report week 3'. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document, likely intended to lead users to malicious content or phishing sites.

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=baltimore+ravens+injury+report+week+3
    • http://files.northcoastmineralco.com/uploads/1/3/0/7/130775596/bubimami.pdf
    • http://files.biodiversitynz.org/uploads/1/3/1/3/131397964/doribimi.pdf
    • http://files.ndkalna.com/uploads/1/3/2/6/132695321/gobumij.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/21076519342.pdf
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/durapivab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/bulazideves.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/73084845099.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/94201514412.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/soputofovezufowabobibam.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/xamoxejatefexofonufotitej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/45395288581.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/23179424027.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/53548669430.pdf
    • https://cdn.shopify.com/s/files/1/0431/1908/3677/files/42995970841.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/51113685456.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/rejon.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/jozuwunozanegotuveb.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_off000078bb.bin
af96a6f45ae348337b005337efd63851525c652bd9747a03de1240a4e08eac89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BB 5452 bytes
font_01_sfnt_off00008b49.bin
c46390bd0e1bf5fcd69d0d9887364ea5a52c4fcb53b79054274c19f09220d3e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B49 14384 bytes

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