Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5b614492567b2f…

MALICIOUS

PDF

79.1 KB Created: 2020-12-08 15:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3fefb3b6a4671d48ad6f333534ad4c04 SHA-1: 1dc5e78479d8b0aa993668d6ece76cf7ffc4e774 SHA-256: 8f5b614492567b2fa13527f6a67e0a7ef800fb78254478a963d2db6a3939355d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'trafftec.ru', which is likely part of a scheme to drive traffic or distribute malware. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and linked content suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=dolby+atmos+apk+download+without+root PDF link annotation
    • https://vunufagedumuved.weebly.com/uploads/1/3/4/7/134740761/xifikosokarova_biwutawubivob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fc2c9466fa08.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/6676609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fad5b39081ef.pdfIn PDF document text
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/d5f1691ad69fc7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f8c777b222ed.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/lenunenomowap.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/5385313.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://uploads.strikinglycdn.com/files/50b102c0-bad8-4cdc-bcdd-67c996f19685/584394399.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51d3bc89e1c4b8fd9e252/t/5fcb0e030814be4f73e2daa1/1607142918950/15805152252.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7915fc2869f0c81c3f745/t/5fcccab7fe657040d58f8d04/1607256763064/36600739576.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc140d917e7202640ec8ca0/t/5fc535739b1ed03538862adf/1606759796309/madojorotogorukivo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eda3ec917750a3d80aaa/t/5fc1a86f5147b148047164a8/1606527087377/evansville_indiana_responsible_bidder_ordinance.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe4a643c02f22b9dda8da4/1606306404072/el_hombre_que_conoca_el_infinito_cuevana.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c7625bcb0228a28e9b31/t/5fcc6e62c00f007ceae0539a/1607233122561/new_smartthings_apple_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba52510-4921-495e-8928-7c26ba78ea6b/jipepimewamutuxapudu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78f50e9133927d90f8a19/t/5fcb1576b6b7366152f2ce8f/1607144822929/the_last_house_on_the_left_1972_review.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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 5360 bytes
SHA-256: 23f6e7eaa439974e342a42b0e869fcd5cf089c4537b7a7f2a42516b30804f5aa
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 10572 bytes
SHA-256: 8793621f9f01c120437e9845ce9f7ca6a96dee55ea0bb2ff4ed937f382c045ac
font_02_sfnt_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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