Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33e8d0526d354c0…

MALICIOUS

PDF

57.4 KB Created: 2020-10-25 12:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ee86d5c77b72762827be9c0f2abc0e SHA-1: 176f50e84a52ee278cd070e0c93839ea3c3702ed SHA-256: a33e8d0526d354c0ffc2ab1fbc484ce212b4f1237dd17e6e5047814c127f4d28
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or traffic redirection. One prominent link, disguised as 'Neff built in coffee machine instructions', leads to the malicious URL https://gettraff.ru/123. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link confirms its malicious intent. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or redirection attack.

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/123?keyword=neff+built+in+coffee+machine+instructions
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/lumurefimuwav-nalexo-fewajugakeka-ributesila.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/dfdff8b9cdd9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/926370cf-35c1-46a4-a1ec-7ce246fde307/87981649341.pdf
    • https://uploads.strikinglycdn.com/files/81d1aaf6-0dd8-48a3-af92-3dec55713a17/spiderman_homecoming_pelicula_completa.pdf
    • https://uploads.strikinglycdn.com/files/ff865589-436e-4132-b1c1-83fc895a8662/42926343933.pdf
    • https://uploads.strikinglycdn.com/files/ccb51c70-0b73-421c-b9b9-2acbbc7114fd/35325462672.pdf
    • https://uploads.strikinglycdn.com/files/5a86f7d6-887d-474e-8c85-fe03b7b5b33a/roku_3600r_vs_3800r.pdf
    • https://uploads.strikinglycdn.com/files/14b1353b-2388-497e-9d4b-e933e2f725a7/vuselale.pdf
    • https://cdn.shopify.com/s/files/1/0434/1245/5591/files/exterior_angles_of_triangles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0268/7277/4850/files/teberuwodevokugefatixu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5330/0377/files/human_physiology_nervous_system.pdf
    • https://uploads.strikinglycdn.com/files/39dd1f2e-a56e-4a07-ab84-cc5f65db2343/grafica_de_control_por_atributos_minitab.pdf
    • https://uploads.strikinglycdn.com/files/9ffa36c5-040e-441b-adde-d12fa19b331c/9315776054.pdf
    • https://uploads.strikinglycdn.com/files/b9698f6f-8d3e-447e-a1e1-c34d179a4a37/pazumur.pdf
    • https://uploads.strikinglycdn.com/files/475bb819-fa98-44ca-8a0c-5b23963099d4/fetewufogupapozoxeza.pdf
    • https://uploads.strikinglycdn.com/files/f52920bc-cf43-4e02-ae62-9d0de1a3981a/fazejiguk.pdf
    • https://cdn.shopify.com/s/files/1/0501/6233/5919/files/morgenstimmung_piano_noten.pdf
    • https://cdn.shopify.com/s/files/1/0496/6832/5533/files/xisevivijajo.pdf
    • https://cdn.shopify.com/s/files/1/0266/8992/9391/files/es_file_explorer_apk_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0504/8949/1636/files/kududotonewovotexozoso.pdf
    • https://cdn.shopify.com/s/files/1/0495/5019/6903/files/subnetting_practice_questions_and_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008864.bin
992d819e7cd91f73300553c9c861384ec59ddaf855003cb9316fb17ddadce25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8864 5228 bytes
font_01_sfnt_off000099fb.bin
e8f640d2faca0030b9ce1267cc7f8206c3c3a13be73ff24b4854b1147cc8e1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FB 11528 bytes
font_02_sfnt_off0000c100.bin
eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC100 16060 bytes

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