Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f6b1d5847e213b…

MALICIOUS

PDF

67.0 KB Created: 2020-11-20 14:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 134030976bf6ec093837cb3022862c7b SHA-1: b1317f66f62be0b2d3a5e4332bb9f3f20da4628b SHA-256: a2f6b1d5847e213b8dadce5936bb542f2c67e87c931a657ae0fb676abbdba734
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=non-solicitation+of+employees In PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/dimaxorozumitak_giditer_sosenowovagi.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/rolelababan_rurimazel_sozodiram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8a1a7c4f011.pdfIn PDF document text
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/7307424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/rafivaram.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/bakugan_leonidas_card.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/amazon_surface_pro_6_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3b766d-a8a7-48f9-9cb6-43584704f40d/bright_emblem_of_nimrodel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f930940b-d3aa-4980-810c-ce30deb4e103/paxalani.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/11222346217.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/divorce_letter_sample.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_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 5168 bytes
SHA-256: 6b12d1c785595d4ea2912a2990ad054bb90e557cd9ebd1ced5ec7488d36acca9
font_01_sfnt_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 9980 bytes
SHA-256: 7b575077fb14cc4cd1d8eecc68745865e67998b079b20f498ceaa1a4782693a0

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