Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1cc55d3e87859f…

MALICIOUS

PDF

43.8 KB Created: 2020-10-15 02:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 28d4aa04c4fec4f712a509148617f3c8 SHA-1: 6dee3fd0a544146c0d4c485c2736a21905625cc8 SHA-256: 6d1cc55d3e87859fb2fb0ba29ea33ec59cc9b10cba9cabe9fa0910f87d76ae3d
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that lead to external sites. One of these URLs, 'https://cctraff.ru/strik?keyword=converting+units+worksheet+%252349+math+092', is identified as a malicious redirector. The document's structure and content suggest an attempt to deceive users into clicking these links, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=converting+units+worksheet+%252349+math+092 In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/613a711ec7ef.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://site-1040140.mozfiles.com/files/1040140/nevuzeregolani.pdfIn PDF document text
    • https://site-1041927.mozfiles.com/files/1041927/55523558439.pdfIn PDF document text
    • https://site-1043295.mozfiles.com/files/1043295/vositemetojanomejojepes.pdfIn PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/1348137504.pdfIn PDF document text
    • https://site-1038488.mozfiles.com/files/1038488/26078887314.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/lizuwiweloxizug.pdfIn PDF document text
    • https://site-1041503.mozfiles.com/files/1041503/rexibotedixuduvolobejes.pdfIn PDF document text
    • https://site-1043850.mozfiles.com/files/1043850/rijegamorarosibawepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7309/2766/files/red_bottom_sneakers_for_ladies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/48943080921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9931/6131/files/301908752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f44f30-46b5-40e0-953f-eb51b422023b/semoxoniri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9600c21e-30af-4548-a185-ae0f23a70d77/71533457536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b483e5-2bd0-41b3-98eb-55b012f22334/xiwezujisavetomagadefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/310ca96e-4bff-4b58-be9b-da735c4f5485/vevapurubebogedosikaz.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_off00006e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 4828 bytes
SHA-256: 153979dbb61fa1fb4e944438f8aad31b6f50e6131e6c272ba8ca793745b7141c
font_01_sfnt_off00007ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC0 10360 bytes
SHA-256: e5be392264dee68ff505ffdb1faa3626d2944f3932b1175c610ac7401cdefaca

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