Malicious PDF — malware analysis report

Static analysis result for SHA-256 87823de8afffee7a…

MALICIOUS

PDF

42.7 KB Created: 2020-10-29 14:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d33c68a68d5868169fe242a99f433d02 SHA-1: 49f87f09634c35a57eca476138b4a9fa714f1a05 SHA-256: 87823de8afffee7a151e7c48c476c412929095fe7bc985a2460cdc72f0447be8
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 large number of embedded links, many of which point to a redirector URL. The ML classifier also strongly indicated maliciousness. The primary malicious indicator is the link to `https://cctraff.ru/123?keyword=jhumpa+lahiri+interpreter+of+maladies+review`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure the user to malicious infrastructure.

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=jhumpa+lahiri+interpreter+of+maladies+review In PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/5026136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5f944e6383dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_5f92556e8bf0a.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/nagev/classification_des_bryophytes.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/gujajemesakemuzezeninepaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/77472082604.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/the_flowers_of_evil_charles_baudelaire.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/42281496850.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/email_marketing_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/assam_tet_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/business_english_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/rampage_parent_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/zapajop.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/19339966922.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/gopogugikejagib.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_off0000695f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 5420 bytes
SHA-256: e8cb9f4f6feb66558638ec2fc205328e0cb66d38b1d05b4dead0be8c6960cd6d
font_01_sfnt_off00007bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB8 10092 bytes
SHA-256: cf8f95d1dc9db472a4c92acf7a422fac1f0a19388ad0882f8368c0fa1c2cd519

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