Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5022961f6c03f9…

MALICIOUS

PDF

40.8 KB Created: 2020-10-29 18:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9114b7f01d48ed4edee82fe92ad0f18e SHA-1: 6228d61ce1bd945ff44c184e617918118041500d SHA-256: 2b5022961f6c03f96a46af1ac5833ba94194461337baffdbdb0b89da01c5ed55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, characteristic of a link farm, with one URL identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to a Toyota Corolla manual and references to the tool wkhtmltopdf, suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=toyota%20corolla%20s%202009%20manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5f908a8517404.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/9452866.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/jamokaroxoj/10881207049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a39f37-b9f7-472b-89d4-39243fa6de6f/59479064063.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/25786099591.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/best_biodata_format_for_job.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0377/1547/files/aapke_dil_mein_jaane_ka_rasta.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/busitozotanuwaje.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_off00006008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 5428 bytes
SHA-256: 529e0ec6477670ad5a8875141731c4f7ca03d319cdb3b9fe87c0dcc5aedd94c6
font_01_sfnt_off00007269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 10576 bytes
SHA-256: a0fc447c9b8da0a96d66d22aefb22d96be25bee794b35fe39dd02e87f9fbec3b