Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4efdeeb45dfecdd…

MALICIOUS

PDF

40.7 KB Created: 2020-11-03 07:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 04b2f34bc2f8bc728144f72cc2387146 SHA-1: 11bb5e686820e858d0e809f90cca2f90b7f8394d SHA-256: a4efdeeb45dfecdd09ecfa59f18ecc6050904b09ff946789fe12513144bb60d5
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The document body, though partially obfuscated, contains a URL that is also listed as a malicious redirector. The presence of numerous external links suggests an attempt to direct users to potentially harmful sites, likely for phishing or malware distribution.

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://gettraff.ru/aws?keyword=last+3+wishes+of+alexander+the+great In PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/9cf4a4513dfa5.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/sadutovolije.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/1748621.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/6602156.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/1/0266/9504/1211/files/how_to_use_log_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/250_gb_flash_drive_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b39fa4e-63c5-44d1-bce1-b20a30b958d2/laforunepuwitinani.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/imaging_atlas_human_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/minecraft_pocket_edition_11.1_apk_free_download_0.15.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5dca50-1484-4d58-a1f0-beb2a5f449a7/linear_algebra_5th_edition_by_friedberg_insel_and_spence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42cd216-cc30-4c9e-aeac-ecaadaaeb9a6/prison_break_subtitles_season_4.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/black_panther_mp4.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_off00006311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 5432 bytes
SHA-256: 984a3c4da36485075557b916dc070d427dbdf3458fcab7cda9275ca20f44bbf4
font_01_sfnt_off000075a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A4 9536 bytes
SHA-256: 1d7da66f3bdf5d342ec64dee9141f7349eaa436604510c206ea28efa763cc9ed

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