Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbee8ebbea399358…

MALICIOUS

PDF

44.0 KB Created: 2020-10-10 06:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 743e6b6f84b35e32b5c43191668466cd SHA-1: 1610cbbf40c96e311c643ed55862d1005864468d SHA-256: cbee8ebbea399358055e2166aacfe8651bca7065c539706e1882a15d94352f08
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. One of the embedded URLs, 'https://gettraff.ru/strik?keyword=dbq+14+the+industrial+revolution+responses', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness, suggesting the document is designed to lead users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=dbq+14+the+industrial+revolution+responses In PDF document text
    • http://fajawod.villageoffenney.com/uploads/1/3/1/4/131438563/junukewefowud-suxizujixug-wusubosidan.pdfIn PDF document text
    • http://files.marlonon.com/uploads/1/3/0/7/130775868/6360de13cb68.pdfIn PDF document text
    • http://vixenil.billsnwphoto232.org/uploads/1/3/0/7/130776078/bb4afb5c2d51.pdfIn PDF document text
    • http://jozej.nexttonaturefarm.com/uploads/1/3/2/6/132695384/gegojod.pdfIn PDF document text
    • https://site-1043530.mozfiles.com/files/1043530/demudoris.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/1196687955.pdfIn PDF document text
    • https://site-1043456.mozfiles.com/files/1043456/bobesuxitowobuvit.pdfIn PDF document text
    • https://site-1043279.mozfiles.com/files/1043279/gigozojigu.pdfIn PDF document text
    • https://site-1038744.mozfiles.com/files/1038744/47858247781.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/1/0497/5080/2593/files/17112685681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8181/3156/files/hk-t6a_v2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4b1de6-13bc-4e3b-b18b-c8dced77e088/78024792049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc6e723-4f8f-4931-80e0-3adcdd0b9f80/rukelikuroti.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_off00006d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8B 5512 bytes
SHA-256: 9eba04903579d0a083211bb272410522386010a5a5bd60196abb24de7a00b15f
font_01_sfnt_off0000804f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804F 10208 bytes
SHA-256: 24295a4980293edb36a9e18d0e8208eba69b89074cab1d3c2e9a9aca2bb4f599

Open this report in the interactive analyzer, or submit your own file for analysis.