Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a6a0324c107734…

MALICIOUS

PDF

39.6 KB Created: 2020-09-09 21:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 738c8f39fc65b82678e5e0b2da3b60e3 SHA-1: 3b6b2ae0ea9f69db21f5165e2fa7569cf1575e06 SHA-256: c7a6a0324c10773438d8da172a56938a7292eebb60cbfa0bb28245a0d8dbc170
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that suggests a lure related to a referral form. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector.

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=nhs+podiatry+referral+form In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/56924900445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/xowejetuwujor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/cell_a_molecular_approach_7th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/negative_effects_of_globalization_on_health.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/diferencia_entre_acromegalia_y_gigantismo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/82497448110.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/808d8c_00bc1aaf7d3e40978cf1068f270600cf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/278743_3243b65681004f3892c6d1ca3bfa5cfa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/565485_53d2467067eb474b98e3b91f3c0813bc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6d3b184bea27474bb7197d5c0a753128.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0a84ca_375e6e6dd58f4ac6a57f5745fae3c36d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e5412a_3f4bfe18a096418d8b33d724af39e3fa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8a4c2a3206e74988a977902c2f6c2f71.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/93971e_cc0f345afd984cfe9589dc836721e2c5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/74e9cf_e9b856f9080d4b6cb3036f8aa2dc867c.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_off00005cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB1 5352 bytes
SHA-256: 11964c854cdf9ac1348568e54c535e0611b76a25a46b3af595b3951e6cdf3f72
font_01_sfnt_off00006ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECC 10088 bytes
SHA-256: eff6a8e416511f002dfb38d3bd1dba7c35a62655d2ac018156d17ebf1fd298b5

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