Malicious PDF — malware analysis report

Static analysis result for SHA-256 392a67c5c34a9241…

MALICIOUS

PDF

45.7 KB Created: 2020-10-14 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 85a472c469ae9a67659df50217e3a820 SHA-1: e3c6b53d592b55b350826bc644042403e87df40f SHA-256: 392a67c5c34a9241e7f665a54c2d2b43268e78891880fdf842ed9d67b6bc342d
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on services like Weebly and CDN-static.net. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier strongly flagged this sample as malicious, indicating a high probability of malicious intent. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to malicious content.

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=tecnam+p2020+manual+pdf In PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/f390996b3af2.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tadib-pepalitegugoj.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/474185.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/puwafewisuxukapo.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/8800606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f86f436280d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f8716e6555a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f871265b9859.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5870292.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/monirafulowafix.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/49320188799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4869/7493/files/nudos_y_amarres.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1570/3197/files/tell_her_no_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2028/7639/files/roradotujivapuwikutuxev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5460/0870/files/46152119423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5418/6146/files/aprendizaje_visual_definicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3123/3180/files/45085066201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13aedd6-b568-436f-9a28-bd3c0370d1c2/2140502174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7d8936-9054-4458-b53d-543ed1e8d8af/2882114852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a314648-b95c-42c7-8f7d-8c308f49c40c/ledolalabomo.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_off0000746f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746F 5248 bytes
SHA-256: fe178ddaed37e5a953f7f35960c618157328c69c5d0d9e7501106a591bd3e030
font_01_sfnt_off00008632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8632 10432 bytes
SHA-256: 828b36b701b2eb0f58324d65b9baf1d096b36662d3674ba1cf0bfcc54976b37c

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