Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1b8fc644d098ee…

MALICIOUS

PDF

44.8 KB Created: 2020-10-04 03:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4196d6960d13f9494f0314a8099fee02 SHA-1: 2e4844b68bb96574c984090295c0ed1b3ab3d750 SHA-256: cc1b8fc644d098eeaf96fdf85fe486d624e29e8d53ab17e4675464c5d6921cf4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malware. The ML classifier strongly supports the malicious nature of this PDF.

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.link/pify?keyword=please+do+the+needful+rude In PDF document text
    • https://site-1042585.mozfiles.com/files/1042585/49011354521.pdfIn PDF document text
    • https://site-1039873.mozfiles.com/files/1039873/60122837023.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/63246175847.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/bavoxen.pdfIn PDF document text
    • http://files.artbylaura.net/uploads/1/3/2/6/132695280/xotujarixupam-najobelisa-zirosibe.pdfIn PDF document text
    • http://tikuj.savvycove.com/uploads/1/3/0/8/130815097/7498920.pdfIn PDF document text
    • http://files.thesomervilleflea.com/uploads/1/3/2/6/132696104/5156277.pdfIn PDF document text
    • http://files.wheatongis.com/uploads/1/3/1/4/131437669/7305018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2028/2787/files/labomopawibutiwawet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3611/0756/files/length_of_vector_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0498/files/2009_hyundai_sonata_transmission_fluid_change_procedure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1258/3334/files/simsbury_public_schools_teacher_contract.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0041/3346/files/gadojuninuxirojof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6833/2968/files/79134098845.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DB 4828 bytes
SHA-256: 2ffb507eb16734b67829449ee6eb1d907d61a220ead15cdc848ff6a95f9227e7
font_01_sfnt_off00007630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 10080 bytes
SHA-256: 1644ec66fdb9626de6c0f2bd13e7d07f8a57385a5f0e32022ba4ad48dca9c0a9
font_02_sfnt_off0000989b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x989B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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