Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c7a1228fd7e9ce…

MALICIOUS

PDF

42.4 KB Created: 2020-10-11 05:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c94db8047ac9e1a6da53f51298ee705c SHA-1: 858a3151e66f20a4dda07c9c4727cd9e70b06cf2 SHA-256: 49c7a1228fd7e9ce0aa74be71479241d42a31104ef592c32c37d9a18c983fab9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to direct users to potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs suggest an attempt to lead users to 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://cctraff.ru/strik?keyword=sopas+de+letras+faciles In PDF document text
    • https://site-1036742.mozfiles.com/files/1036742/kaditoxix.pdfIn PDF document text
    • https://site-1040442.mozfiles.com/files/1040442/manepojepak.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/gikegetoremifupizejage.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/vigodalemonila.pdfIn PDF document text
    • https://site-1039957.mozfiles.com/files/1039957/navos.pdfIn PDF document text
    • http://files.hightopconsulting.com/uploads/1/3/1/3/131383934/diwozofeze_kituxor.pdfIn PDF document text
    • http://buvomuwu.mrshandyman.net/uploads/1/3/2/7/132740778/rurukelosoburo.pdfIn PDF document text
    • http://zizote.artandsoulcraftgallery.com/uploads/1/3/1/4/131437252/3046714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e95656-40af-4725-8ca1-2a1e128616e2/26987180612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7504858-dc7b-4ba0-af37-8b27556e309b/jageg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/zalef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9017/4886/files/roblox_fly_hack_no_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5540/5992/files/11583209496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6284/9436/files/iasb_framework_for_the_preparation_and_presentation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7323/2291/files/corgi_puppies_for_sale_in_iowa.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 5252 bytes
SHA-256: c9979b1171ab4e76e3204f7a3b36d71af263aae85bd9cf8df9145280c54fb01c
font_01_sfnt_off000076dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 11344 bytes
SHA-256: 122ec768e9cb68df394087b14ca58c67c0dc4ced321fe88a51e288c8aa6530af

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