Malicious PDF — malware analysis report

Static analysis result for SHA-256 291505d406ba01a5…

MALICIOUS

PDF

38.7 KB Created: 2020-08-25 01:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c6261400da535d2d32414ffd2987d3 SHA-1: eb9f76fdd55d31c6eabff440189af0e7f299e7c7 SHA-256: 291505d406ba01a5548687f6bd846169be14ff48e406943f73da6eac15cdc488
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, pointing to 'https://ttraff.ru/pify?keyword=applied+biochemistry+and+biotechnology+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links, suggesting a link farm or redirection attempt. The ML classifier also strongly indicated maliciousness. The primary attack pattern is a lure to a malicious site.

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=applied+biochemistry+and+biotechnology+pdf In PDF document text
    • http://xejagok.healingdigestiveillness.com/uploads/1/3/1/8/131871390/nasudiwitezorosav.pdfIn PDF document text
    • http://nupovi.allendaleunionchapel.com/uploads/1/3/1/3/131384306/lazodenop-betuxivesemosax.pdfIn PDF document text
    • http://bifof.scssps.org/uploads/1/3/1/4/131453046/3405eb01d20651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/65666138014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/wozumazejirisibilaxunij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/eba_guidelines_outsourcing_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3991/5175/files/tujozomajerobegiteje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1753/5397/files/xodumixoxojemimavet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/35893464703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/19868676337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5772/6118/files/39686791256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/juremepubinuju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/88820964587.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000579a.bin
b464919a279fdd949236a65d1f344fa9c6036d9465632142a37817cc0f1a40fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x579A 5800 bytes
font_01_sfnt_off00006b24.bin
6b1db1202baa7cec03a46a58f5ba7da39441aaaf09d0d22514ed79b1d33110b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B24 10180 bytes

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