Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc5e471b13cdcba…

MALICIOUS

PDF

41.8 KB Created: 2020-10-15 20:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0af131c31e7a09f7b14b8205c0275afe SHA-1: 785ab847dbe2910e1a551367aff0540f41804588 SHA-256: ddc5e471b13cdcbacd880d38085d560e370ad1d2c4e66602180b184da0529fde
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the primary purpose is to lead users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=pictograph+worksheets+grade+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f87494e626f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f8813b9c59f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f87d9a70f4cc.pdfIn PDF document text
    • https://site-1039539.mozfiles.com/files/1039539/31002872478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f87a52cd55ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f882b2f6fbba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f883a39ab6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f87b886a98ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f88864c4f9df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f86fc42e7986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f883c34e2006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8811f3192b6.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/jatinerifa_dozad.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/togiluxafik-kipesegeluwedas-juwisoxoweruzi.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/sotosisezabejasudigo.pdfIn PDF document text
    • https://site-1042617.mozfiles.com/files/1042617/39922291105.pdfIn PDF document text
    • https://site-1039492.mozfiles.com/files/1039492/musakozolemogujaxev.pdfIn PDF document text
    • https://site-1038310.mozfiles.com/files/1038310/perezavepubunegabon.pdfIn PDF document text
    • https://site-1043873.mozfiles.com/files/1043873/pukelubowujasopusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 5596 bytes
SHA-256: e0cf0fbd01efd4b3702a924be16af0a7d575a18d0f17286be95860d764ffadba
font_01_sfnt_off0000777f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777F 10064 bytes
SHA-256: f7874d06f3e26b9efdba335b045b42b3fe58f6e304743db30d4454d5ce220282

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