Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec2b65616e97969…

MALICIOUS

PDF

39.7 KB Created: 2020-10-28 12:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eb93b32b0c4322110f3bbc3a4b171e06 SHA-1: 3a19adb21a078d28f5ac19baf57a96a20c82dfbf SHA-256: 6ec2b65616e97969a825a4c9b5b84c682156d13b59de89981833298245c06b26
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and a link farm, indicating a phishing or malicious content distribution attempt. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing lure, likely attempting to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/strik?keyword=wish+you+were+here+incubus+tab In PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/d4dd6e9489.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bavamokexupujif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f91ef19f258c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f88f0b8749b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8777d9cbdc7.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/dumexi_naloporuf.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/kunolakisosamuxexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68602f5b-09f3-41f8-b459-d2daa3586e78/itunes_64_bit_windows_7_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9340904-a8db-4f25-b74a-f7fa287b2491/52165241102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9882/7678/files/ecuaciones_logaritmicas_y_exponenciales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f301caa1-adf4-4fc0-b16f-8ae196e58a90/29844614557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff94084-28d5-4c36-aee2-c8c948853d47/adding_and_subtracting_decimals_less.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/8174884237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/6226468928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0669412b-d048-4e9c-a078-63e9a9a5a6ea/jegezona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9654/8524/files/killer_worms_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9382/3139/files/jozususamevixatoparuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7776/3226/files/corel_draw_11_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781bebb2-76c9-44c3-a256-393fcfc8aa31/xeroxivafijin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7634/1926/files/kia_sorento_parts_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0338/0390/files/weruponig.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_off00005b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B28 5204 bytes
SHA-256: 511e69bf1180c98da370ffce83639b14d703d13f38d7a8662afaf5a3fb8f1ed5
font_01_sfnt_off00006cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF4 11268 bytes
SHA-256: 3faa31252cd6e73bf65338de18afe51f556bc56ffd411a89154de9948bf9eed8