Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7b924c66643a7a…

MALICIOUS

PDF

42.9 KB Created: 2020-10-25 20:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 048b2844e249fe51ed976a9f68d76a03 SHA-1: 814740432015516e29f0f532ee939f25011858f8 SHA-256: 1d7b924c66643a7a7e12871fae83bb145e591cbc23e366aaf86aa70df8bc3096
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 farm, with one primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs as observed in the heuristics, suggesting an attempt to trick users into downloading files. The presence of numerous links to S3 buckets and other file hosting services indicates a distribution mechanism for further payloads.

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/123?keyword=dynamons+world+pokemon+mod+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5f8e435152ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f88f6ea614ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5f9155787788a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/futosodanujukufebomut.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/sotejiwebarovezufonikujo.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/fadiv.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/the_crc_encyclopedia_of_mathematics_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf7dd4f-5384-4538-9876-07ec14c88c4c/52704982268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac191e7-e4b0-418d-a14d-03e9da6dc1ee/71104475082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9b7de3-8767-4724-b0ea-d9b5a389bff3/71919463900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89f3b2c-fa8c-49a1-bae3-f0c954b34d02/gurejowinuxolavekuwugexar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d69ac9a-b012-4130-85fb-afa2d43e7a02/sufejogevotewozofezomit.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/autoimmune_lymphoproliferative_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/business_development_head_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/55665783161.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/3717831453.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/7231389612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45292fff-4be1-4dd5-a930-2e8c19e1da22/coup_de_pied_chass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf462a63-ed6f-4648-bacb-17f0c3aa8795/2099252965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29ed281-1220-4ed8-bda7-34ed049fca3a/zoram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/pronunciacion_en_ingles_de_palabras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4237/3785/files/tunuzaladoxevodosipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5348/0601/files/zoverijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7252/8799/files/babefutasadebowut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9315/0875/files/wuziwonugosuj.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_off00006964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6964 5364 bytes
SHA-256: 83e8a4d1a9621828db39afdbcbef2a10254c584efb33bdfefe1d5963f5aeee38
font_01_sfnt_off00007ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA0 10068 bytes
SHA-256: 84b2886858ae63af7e2e6bae10517a0e3c95a3ff0b33a1cc3322f4f8f3635f5b

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