Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0ac5af56565163…

MALICIOUS

PDF

47.9 KB Created: 2020-08-25 17:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 364b72eb5e384f021d0e73180a4b0cf7 SHA-1: 84284b34f02fd0b73bbed7975fc39376ff126e26 SHA-256: be0ac5af565651636378a16c6f7372a8e3e17602de6d90613a7a08b2dae0d0a2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains numerous links to external PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be luring the user to click the malicious redirector link.

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=adobe+illustrator+cs5+for+mac
    • http://velero.jocelynjacobson.com/uploads/1/3/1/3/131398539/1235618.pdf
    • http://vupar.rbcrowtherco.com/uploads/1/3/1/1/131164250/jamekazowaweb_mibevozileb_roxuwumitifuzob.pdf
    • http://files.hinisha.com/uploads/1/3/1/0/131070178/d39c8c.pdf
    • http://ketimode.healthcaremedicalcomp.com/uploads/1/3/1/3/131380600/2e092b93007017.pdf
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/non_disclosure_agreement_template_for_employees.pdf
    • https://cdn.shopify.com/s/files/1/0440/6290/0374/files/migugofujutugunapebalug.pdf
    • https://cdn.shopify.com/s/files/1/0435/7976/8995/files/63935017974.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/atresia_de_la_pulmonar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/rufonaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/arizona_attorney_general_dnr_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/main_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/35341071282.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/boost_your_vocabulary_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/oum_kalthoum_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/mogumupulagupawit.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/eclipse_2019_zip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.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_off00007d3e.bin
cf08f0b8ee2d82bd5766df2994ba7d2b23288d5266c73c18954fad3fc94fef4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3E 5420 bytes
font_01_sfnt_off00008f92.bin
50282ceb85e992e898177210d4f5be2e128b9d60cce2aef41d469328c5ca6528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F92 10304 bytes

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