Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcedea3df6650c2…

MALICIOUS

PDF

35.1 KB Created: 2020-08-30 18:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f7625be7033d9d93ac5013a8f4ad85 SHA-1: 3cb2667dc1fff4ad144c01fc2c921ddfd81a2575 SHA-256: 0fcedea3df6650c20f5d394c5c80a97a4fdb731ca5e33f93533a5c3d547688c3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to malicious sites. The document body, though heavily obfuscated, contains this URL and a large number of other URLs pointing to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful 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/wix?keyword=lfs+egzoz+yamas%25C4%25B1+indir+kindir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/wazuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/bilirubin_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/javorobex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/nowirisudutoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/72574901702.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/85582868516.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/bill_of_rights_amendments_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/applicant_letter.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/44216601182.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9701/files/model_cerere_concediu_crestere_copil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/valebi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/62677344339.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_off000048a7.bin
f45e1a74ca6ff3a403362263e6feec057b3c8994b0330b58fdcfafac00f10cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x48A7 5384 bytes
font_01_sfnt_off00005afb.bin
eba7a6caebc6b0e470ce10cd9dbbfd2beab0dd7db54fc93cf1a6ba9ecd81c0b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFB 11236 bytes