Malicious PDF — malware analysis report

Static analysis result for SHA-256 f293a6111874f865…

MALICIOUS

PDF

42.3 KB Created: 2020-11-05 11:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f69406eef7f6f0a596bb8697e7c357ea SHA-1: 171f323fb77e437173702bd9b67e2e627c23a11c SHA-256: f293a6111874f865c741a6c4a6b5883e49c8f5c1503e143bbb7c03aa41d57c55
154 Risk Score

Malware Insights

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

This PDF file contains a high number of embedded links, with at least one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The embedded links, including 'https://cctraff.ru/strik?keyword=2020+citrus+bowl', suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware. The document body contains obfuscated text and a URL that appears to be part of the malicious redirection chain.

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=2020+citrus+bowl In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f8df631c05f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f926262b2101.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/xekukuw-forolopofezej-latiwigekiz-parapevu.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/b795bf96-4493-4d6e-9d8e-ab009f50f52a/dhaka_vice_city_game_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d888b4-2264-46d9-bac0-7cb9f471f27a/53088248362.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/i_m_barely_breathing_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/register_of_deeds_in_monroe_county_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/english_urdu_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/vikajikovinur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc62400-1206-4602-ac2c-77dd8ad1ce95/noxomijanenalipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c793f84-7b14-47bc-bbd2-615df318c7f3/zewok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c96b17-a3b0-4791-b706-a3216f5193b0/newiviludekuxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e17050-7103-4a77-9fe9-e642b96d988c/87334873124.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_off000064ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CE 4992 bytes
SHA-256: 4f1150a3825f14cda3a8cebcc16454c00a5c99b2c4291becb962371efa851e43
font_01_sfnt_off000075eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75EB 11416 bytes
SHA-256: e67ecc93f6c2cfadf4be816fdb41aaa3702bb784e470a1600daec020f8be4480

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