Malicious PDF — malware analysis report

Static analysis result for SHA-256 d935171f875b4df9…

MALICIOUS

PDF

50.9 KB Created: 2020-10-07 06:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 93e856c59ca56afd2f67fc9cc3688d87 SHA-1: fc1bbfaee38560c37d9daa245e81801610a7b714 SHA-256: d935171f875b4df9c41b00155d78198663ac63a2ca37209dda8af44818d55a60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, masquerading as a book-related document, to direct users to external websites. One of these links, https://cctraff.ru/strik?keyword=sixty+stories+by+donald+barthelme+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed for malicious redirection.

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/strik?keyword=sixty+stories+by+donald+barthelme+pdf In PDF document text
    • https://site-1038919.mozfiles.com/files/1038919/givodawudegebamesip.pdfIn PDF document text
    • https://site-1036748.mozfiles.com/files/1036748/bured.pdfIn PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/85051634415.pdfIn PDF document text
    • https://site-1039360.mozfiles.com/files/1039360/kodunusoda.pdfIn PDF document text
    • https://site-1041084.mozfiles.com/files/1041084/jepafuva.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/42347065852.pdfIn PDF document text
    • https://site-1038635.mozfiles.com/files/1038635/xagiwowevi.pdfIn PDF document text
    • https://site-1048452.mozfiles.com/files/1048452/gewidokeveguzoji.pdfIn PDF document text
    • https://site-1038467.mozfiles.com/files/1038467/58219900724.pdfIn PDF document text
    • http://momarap.keirhardiesociety.org/uploads/1/3/1/3/131381806/varekaguxonudonamena.pdfIn PDF document text
    • http://genigo.creative-soul-coaching.com/uploads/1/3/0/7/130776485/nugelidiwuzemelor.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://cdn.shopify.com/s/files/1/0433/6254/9910/files/northwoods_property_management_or.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8573/3528/files/imposible_quiz_42.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3607/7980/files/b-25_mitchell_bomber_rides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/7468/3815/files/pazufonodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/scotts_hill_tn_zip_code.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_off00007c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1F 5484 bytes
SHA-256: b9d5165ea6bde379fd0f410e5e35b621d30e1ba00909880b07d232ab9bb5b8b8
font_01_sfnt_off00008e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E91 9920 bytes
SHA-256: 6b53b578d61378bb9ae81e1e3b528ad80aa2d5cef614ef49f47aa14a008dda64
font_02_sfnt_off0000b086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB086 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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