Malicious PDF — malware analysis report

Static analysis result for SHA-256 08edf0795acf7443…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 12:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43ef8696b3ade18d55d58e164047b244 SHA-1: 1bf40417383ab8a1528c551b3634dcc89f32efde SHA-256: 08edf0795acf74434ed1db6d9a20c00fb32f82b079665fd4e9efd262938c7db3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded links likely serve to direct users to external sites, potentially for phishing or to download further malicious content.

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://ttraff.ru/pify?keyword=folder+template+sharepoint
    • http://files.madaassoc.org/uploads/1/3/1/6/131606094/dda01edd.pdf
    • http://files.welljapan.org/uploads/1/3/1/3/131398194/pusadedak.pdf
    • http://wiwemuz.martinhartfilms.com/uploads/1/3/0/8/130814328/c4272d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0423/9783/files/github_upload_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/9158/3391/files/wuvoxikazokinute.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8083/files/38059293849.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/robagegefoxutiduraz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/47909660108.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7975/files/double_sided_adhesive_sheets_staples.pdf
    • https://cdn.shopify.com/s/files/1/0436/9838/9145/files/animal_characteristics_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/xonurize.pdf
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/nipafiripudikulagafevaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/14136609570.pdf
    • https://cdn.shopify.com/s/files/1/0436/5484/0485/files/monawagitiseregupubekuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/mcdonalds_coupons_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.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_off000069a4.bin
47dcc2bfec4b2a1254c8fae55ac91c12258104a87753e5d5549714fee05d6841
pdf-font-stream PDF embedded font (sfnt) at offset 0x69A4 5156 bytes
font_01_sfnt_off00007aff.bin
aaa4c295e03e50106439071383f8523c14775b11b923e28c50810c9ee74d4179
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 10292 bytes