Malicious PDF — malware analysis report

Static analysis result for SHA-256 796da9884823c4d7…

MALICIOUS

PDF

43.6 KB Created: 2020-10-15 03:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5be1cf3a7bfaeb7fe5e194e337ee2de SHA-1: 6032f53484e2ce18ff84f88020be1e418466a790 SHA-256: 796da9884823c4d7bd8e6daf6bf8958f068674028f72338475ff6ef002a32f86
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious due to its function as a link farm, containing numerous embedded URLs that redirect to other PDF files. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document's content, though partially obfuscated, includes URLs that are part of a link farm strategy, likely intended to distribute further malicious content or engage in SEO manipulation.

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://ttraff.link/pify?keyword=demonstratives+worksheets+for+first+grade In PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/divuj.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/9402018.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/7f60432723aa63d.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/motirala-vepojivoral.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/javepora.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • https://site-1039846.mozfiles.com/files/1039846/65899140711.pdfIn PDF document text
    • https://site-1036684.mozfiles.com/files/1036684/bobebixemotekokaxax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db72f36-5c38-49ab-8278-e3488c731ac4/voregeguzozovibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536dee1e-0213-47aa-81b7-481aa4763070/dewovan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e00daa-4a20-4549-a3ca-b8f98f43e8e2/74233485134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6706/4991/files/21132732019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7478/3906/files/states_of_matter_lesson_plan_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0079/3768/files/14014858912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389c9358-5c69-4036-b93e-8648a66b643b/gunekevogimovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07612dcf-57e7-41af-91a9-6a8325236129/kojej.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_off00006b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5A 5504 bytes
SHA-256: 7633c5d738fbf9d9a29fd1e809b3dae4c94b0d0a296546ec26be1a0dfa9f9c86
font_01_sfnt_off00007dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 10252 bytes
SHA-256: 811f480ed3d7f54a3d7e87bd21c838832f8ecb1027ca86d6674490e8e53a458f

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