Malicious PDF — malware analysis report

Static analysis result for SHA-256 885e66c0a2f066e0…

MALICIOUS

PDF

70.0 KB Created: 2020-11-24 04:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51f2de337db4922628a3499957d6cb4 SHA-1: 74179cc8c502755d6a800ae15930dd7816db3675 SHA-256: 885e66c0a2f066e03c27acd3cb42af3e05da4fef418d89ee69352f696b69ae03
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a download lure. The ML classifier strongly indicates maliciousness, and the presence of embedded links points towards a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

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/strik?utm_term=download+shape+of+you+mp3
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5f9e82213f833.pdf
    • https://zusiwugebibod.weebly.com/uploads/1/3/4/4/134484471/7156155.pdf
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5fb5d2a5c366a.pdf
    • https://cdn-cms.f-static.net/uploads/4381534/normal_5f95c8547ab1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14c4b235-97cc-4092-b023-c8c1ef7fa617/xiviginevisekomozanerot.pdf
    • https://uploads.strikinglycdn.com/files/650c90fa-ce2d-4df0-86e3-6f97bbf674a2/pittsburgh_pirates_all_you_can_eat.pdf
    • https://uploads.strikinglycdn.com/files/4a785929-e501-468c-a803-9fc32c805167/blockchain_revolution_don_tapscott_free.pdf
    • https://s3.amazonaws.com/pavujiniz/bodelapokidu.pdf
    • https://s3.amazonaws.com/vedexajawo/45321787001.pdf
    • https://s3.amazonaws.com/sugowubuf/cattle_feedlot_business_plan_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/35ef3a5a-7904-4a05-9520-f40391e05bf4/pavegifeturimopofakuw.pdf
    • https://uploads.strikinglycdn.com/files/48b25df5-d675-4b62-93ed-f48ef9a64be5/68368977582.pdf
    • https://s3.amazonaws.com/xasovewipeje/employee_self_evaluation_sample_answers_productivity.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc60.bin
b7edace5f5b855795dd8dd809b4d9ecda601a2a0c58af58c91c6b486c1711b62
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 5540 bytes
font_01_sfnt_off0000df3d.bin
d2adc5a0e9c26ac450384c39be7b2cd51c11709a5ba6981b176549a783198cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 13992 bytes