Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5fba1c2ec4bb96…

MALICIOUS

PDF

49.7 KB Created: 2020-10-28 21:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bd5c8099c7977f7fbabf9b8639f27c0c SHA-1: 89d4cc4b8b57117b655ee4903273e7f9f73c4992 SHA-256: 4b5fba1c2ec4bb96e4191bbaed5c4bac44d434124b8a4d2cd0f956d7c6b0e136
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or spamming operation. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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://gettraff.ru/strik?keyword=17th+century+france+timeline In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f94b244e1220.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/6fe84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f906ab8d8197.pdfIn PDF document text
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/a233e184b6af5.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/4147942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/24174624217.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tasipetukiguse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e021b8af-2628-4deb-a6d7-2a916192ad0e/pictoword_level_109.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/erven_a_ern.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/fx_audio_dac-x6_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754ccf5d-c581-449f-a229-651a8ec8ccc7/tejifivafem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b8a65b-f6f4-4c4b-a26a-5ced21dce597/56545517347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb897840-549b-4697-8a46-ed81a72ebbb9/wolfteam_hile_envanter_hack_indir_gezginler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0cb92f-49eb-4274-8120-086aab2ad5f0/lemovejo.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/scratch_programming_language_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e0da0b-a789-4407-8333-56fac3f73e73/82124566547.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/pokavanobibipotixalan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026b635c-143d-49bd-bafc-6d1a2c2dcee4/65918244707.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/definicion_de_antivalores.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000761b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761B 4852 bytes
SHA-256: 688bcc170df72f50f6d4c6a39941ae3d5d21393566d840a8830385a5fb20a3f0
font_01_sfnt_off0000866c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866C 11096 bytes
SHA-256: 5442a1de4eb25e67e4e50eed52d1194510d542b7506a2890d46b670c1b502c96
font_02_sfnt_off0000ab69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB69 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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