Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbfb5b17cbfd5ac…

MALICIOUS

PDF

41.2 KB Created: 2020-11-03 12:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0006e7747afe67f6ef49d60629f91bd0 SHA-1: 111a92b73ca13690bd7883eb101c04df9540f185 SHA-256: 9bbfb5b17cbfd5ac5013babd5621ee60373d3f602b6e9aa9c82ad40e3510e7ef
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 to a known malicious redirector, disguised as an answer sheet for 'To kill a mockingbird'. The document also functions as a link farm, directing users to numerous other PDFs hosted on various platforms, likely for SEO poisoning or further distribution. The ML classifier strongly indicated 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://cctraff.ru/aws?keyword=to+kill+a+mockingbird+answer+sheet In PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/bekupisikisu_weludepiw.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/rutifik_bebovi_wofima_vigol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f88875c567e9.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f8e22da69d86.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/divexikav/94464061947.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/97126507436.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/sogute.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/18994031008.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/jomudawujavoxodafomuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d851f0-80e9-40da-9e96-e3230cf1b77b/polikivazowuwofu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/8663496457.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_off000062c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 5600 bytes
SHA-256: 3583595f5ddea84c34963397e4637fe7b7fe55a977fe78b1cf6e6d9f7507ed16
font_01_sfnt_off000075af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 9988 bytes
SHA-256: f6d7130ead9fd061f02aa01b14eb2ed6cca4731d13d8f1fb407bb06ddda3c49d

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