Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd8dac44a801b1…

MALICIOUS

PDF

42.5 KB Created: 2020-08-09 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f0362bb28db052c28436d97c138c89e7 SHA-1: 330060f520a9fb96219b34ff78929665fb128790 SHA-256: 18cd8dac44a801b1dc7800867bd975c2fbf750ce9dd40d65628ac488791565e3
154 Risk Score

Malware Insights

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

The PDF contains a mass link farm, with a primary link to a known malicious redirector infrastructure. The document body, though obfuscated, contains the same URL, suggesting an attempt to trick users into downloading malicious content. The ML classifier strongly supports the malicious verdict.

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=the+holy+bible+in+modern+english+pdf In PDF document text
    • http://files.sccottawa.com/uploads/1/3/0/7/130776350/8673766.pdfIn PDF document text
    • http://files.huttvalleysportsawards.co.nz/uploads/1/3/0/8/130874102/8271245.pdfIn PDF document text
    • http://files.oneofthosedays.org/uploads/1/3/0/9/130969925/5530383.pdfIn PDF document text
    • http://files.donaldaschustergreenhouse.com/uploads/1/3/0/9/130969357/depagoduseke-sewapuz.pdfIn 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/1/0433/0687/7080/files/fesitoxerevujadutag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4279/7730/files/62073523911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6388/6495/files/69998979483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/4590768220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/albert_camus_yabanc_yandex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8833338052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/mizupasanisuzasadagapugal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1404/4323/files/twitch_how_to_change_stream_title.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/zofipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/44000626253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/nepok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/37719175104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/xuzat.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_off00006605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 5436 bytes
SHA-256: 9cd1b5cd9156d5a5f1861c6180653868daecbe7b7272dcf9d3e7e83cf2d5bffb
font_01_sfnt_off0000785c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785C 10820 bytes
SHA-256: cda5ada2834448a05ebcb5bd795eb13501da6c254a737112a9ea1904372aadf9

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