Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaa2ac8cb1c46fd…

MALICIOUS

PDF

37.0 KB Created: 2020-10-06 09:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c0a4cffc9482af6d4487e9d7716936d8 SHA-1: f8fb9f9bc5e20c54339057b1b4bb890d027444f3 SHA-256: fcaa2ac8cb1c46fd70b5399db9c2b4a2c394606722c6ce1835faba6db70fbf93
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the primary links, https://ggtraff.ru/strik?keyword=envoy+t%25C3%25BCrk%25C3%25A7e+dublaj+izle, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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.
  • 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/strik?keyword=envoy+t%25C3%25BCrk%25C3%25A7e+dublaj+izle In PDF document text
    • https://site-1039889.mozfiles.com/files/1039889/kesokasivokanito.pdfIn PDF document text
    • https://site-1039675.mozfiles.com/files/1039675/vubuzufesujejumapip.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/vuporibapexifuje.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/lefajofuv.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/1/0465/8167/8247/files/wuvijalidofepubaborudola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0999/1075/files/12266181275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7118/3775/files/commas_and_semicolons_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/furnace_gas_valve_replacement_cost.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/the_second_sin_thomas_szasz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6902bd34-ef0d-4b30-9afd-2322c3fe541c/dokonidibanilezafewuzore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4172efd-7230-4e58-a0d0-273459e767e7/80609906969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45311bc1-1eaa-4ef2-b34e-f1a9ced0ed8d/54936757137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015c948a-1cdc-410d-b9bb-85e491d0c910/91191919339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/50160993189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/7264/7331/files/ronuxusuvubenibebom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/6951/4404/files/curly_wurly_bar_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/bingo_blitz_support.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8960/6294/files/armitron_45_7012_set_time.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4F 5392 bytes
SHA-256: f2fd4da99a083799400d82993c7ee5797eb690474ce985eb6b803940cd01c968