Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d7691fbadf89fb…

MALICIOUS

PDF

41.7 KB Created: 2020-10-27 15:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 43b1b17e9077da9195a313144aefa5a2 SHA-1: b5c2443a3208c0378080434379f6e17a4d5229d5 SHA-256: f4d7691fbadf89fb2aefa07928f5d1144bd8b4ff3c9964b9de25c709665c0a3b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised as an answer key, which redirects to a malicious URL. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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://ggtraff.ru/123?keyword=work+and+energy+worksheet+answer+key+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8bbd6876b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5f90147e4f3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f8ec42d6a3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f8cb644d25a2.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/51cf9.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/vefodajopavokudojo.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/3699879.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/1/0430/5498/9466/files/coleman_mach_thermostat_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7728/7070/files/pneumonia_nursing_care_plan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/faxasolovupozamulude.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/dutimozozeg.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/54030271754.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/76748168810.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/11510450335.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/antibiotic_resistant_bacteria_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/physiotherapy_treatment_of_carpal_tunnel_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/catalogo_bofrost_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4425c1df-d3ef-4d7b-95ea-b592b7246990/76372656350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ccbeee-4f63-4153-8db6-8a8be5b8875c/difebefugamugoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a87b27-c0b5-4ff2-a003-93af0caaa294/87582970205.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_off00006327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6327 5540 bytes
SHA-256: efe181db2556249e0d256d853c0deec15b53b2b2ca317f6a819514ae190763d1
font_01_sfnt_off00007625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7625 10464 bytes
SHA-256: fe588c8ddd58fb5f2311fda42a65e41a5c29b0848e0ed0f94edb29f0738ab0f3

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