Malicious PDF — malware analysis report

Static analysis result for SHA-256 621cf5539206dd20…

MALICIOUS

PDF

42.1 KB Created: 2020-10-30 23:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e43416139b9fed5356921c59daf8ae83 SHA-1: 2a0bbfb36a869903900ecc43ea2d76b28356f223 SHA-256: 621cf5539206dd20473650431202e730f9e701d7529cc356ecefbd736f43f896
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=data+warehouse+design+modern+principles+and+methodologies+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f893d4e388e0.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/ruzewepejewiramali.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/3723785.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/9bcc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f8d4048289b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5f9af51b76f8d.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/bedon-sebewuletimo-tabebavin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8755adb96cc.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://s3.amazonaws.com/roxawo/5620139944.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/39193508387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdbcb989-a0b3-42ba-9fea-d1b878665d22/a_receiving_report_is_used_for_each_of_the_following_select_all_answers_which_apply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b656896a-38f4-442a-aa6d-def4507d3971/17745435913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f939e1-783c-470d-9315-5f7a520481be/24279644925.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/rakidabefe.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/xosivobadididikumo.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_off000056ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56EA 5540 bytes
SHA-256: eddab9643b1aa7fb8989fec3c76f20f3610b2623fbb0c7b8cc35cedbddc3bed1
font_01_sfnt_off000069ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AD 10588 bytes
SHA-256: edb6722b6ce9de536eab87ff33ea3a0f7332503626689eb44bda2f64231e3133
font_02_sfnt_off00008cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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