Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc4f1b78da5f803…

MALICIOUS

PDF

44.2 KB Created: 2020-10-01 19:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8bb0e6c9dc5004bd7d63a0ede0a3a088 SHA-1: c5e3e48389d37eac19dd6028a716ec09f96cd8e8 SHA-256: ddc4f1b78da5f80331c47a6554b342ac7ddc1ba95096a9dab7c15f35f19ef3b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site or download. The heuristic firings indicate the PDF is designed as a link farm, likely for SEO poisoning or to distribute malicious content. 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://cctraff.ru/strik?keyword=arquitectura+bioclimatica+pdf+libro In PDF document text
    • http://jovexu.hixon50.com/uploads/1/3/1/4/131452743/db90d9cb.pdfIn PDF document text
    • http://files.asenathmustang.com/uploads/1/3/0/9/130969192/duwazagegiw.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/1/0431/3320/6689/files/nazejaxuborodapibame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5856/1175/files/ti_89_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/pudoxafor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/83625878550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/auction_house_wow_classic_cut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0375/1844/files/hex_map_of_greyhawk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/batag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2155/6122/files/jeniresipurawetetukenuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4fd7a3-2ac7-4f0a-b6e6-99e5cb57affe/dawuwikivuvavugipefan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200039d4-ce1a-4057-a23a-611d0afffbb7/11206776764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e346ef-e047-47e6-a1ff-d097ea94ab68/58638220070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacda6e3-d16f-42a6-99cc-932377ba82bb/gamefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea4e596-b5f9-485c-8ea5-3f3e8e0b3852/40748751412.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_off00006f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1D 5380 bytes
SHA-256: 75d9cc9f9c76a951d07f2921d9e5e2fa5e9905d25202db6ed7bad09e388179f6
font_01_sfnt_off0000814b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814B 10204 bytes
SHA-256: 2cd3be5bf2ea510a29a1c8a63c6d652ae521ef914e7c88f6ecd29a432a877811

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