Malicious PDF — malware analysis report

Static analysis result for SHA-256 442c0997c8a6fddb…

MALICIOUS

PDF

48.5 KB Created: 2020-09-30 22:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2989eaf5a614a4e64fcd6160bc108df6 SHA-1: 513b503d131ca22ab482f0d0be7e2d04413053d9 SHA-256: 442c0997c8a6fddb2424b513c99d9f064940cf2f7f3f307d4337f55ed81941d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a coordinated effort to redirect users to potentially harmful 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://cctraff.ru/strik?keyword=atraumatic+extraction+pdf In PDF document text
    • http://pipin.kellytruax.com/uploads/1/3/0/7/130776180/vesamig-wowuwesak.pdfIn PDF document text
    • http://files.forestlakeshores.com/uploads/1/3/1/1/131164236/wedamukal-kagidipas.pdfIn PDF document text
    • http://girixaza.headsuptraining.co.nz/uploads/1/3/2/6/132695384/b7431369.pdfIn PDF document text
    • http://files.hopskipthump.com/uploads/1/3/0/7/130740429/6631528.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/04a7fc03-258a-490c-ba1d-dd44ce8212be/47336259464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536dee1e-0213-47aa-81b7-481aa4763070/dewovan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b019d552-0d31-4a68-aa90-89c0dd56ca08/tamagaba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2951/0814/files/chugiak_high_school_football.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/nursing_care_plan_for_mitral_valve_prolapse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9437/0213/files/81063006209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3588/1383/files/dekukikewegitulinurajox.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_off00007f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F61 5148 bytes
SHA-256: 98f50fc3b0b7b2e2125d54083c95baeb9a8901f38e3e5e8521abfef2cc15bccc
font_01_sfnt_off000090d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D7 10692 bytes
SHA-256: 5e6e76cefc1d6d89d64088aeb2bd769d4dc18e438a867fc7ab110cda1a241e0b

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