Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a00442bcd9b3ddd…

MALICIOUS

PDF

47.2 KB Created: 2020-09-30 18:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3eb284ea1d03b07487510bee6067e105 SHA-1: 813ec2c4b6af4d8e81b6049af0144f6d1386ba06 SHA-256: 3a00442bcd9b3ddd744059572ed7e564644d501ceb0fae2d9c7e9c93741e07c2
192 Risk Score

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=certified+bookkeeper+exam+sample+pdf In PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/74421149589.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/60147794432.pdfIn PDF document text
    • https://site-1037887.mozfiles.com/files/1037887/guzasa.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/53723345192.pdfIn PDF document text
    • http://files.teastowels.com/uploads/1/3/0/7/130776338/63289.pdfIn PDF document text
    • http://files.lynettewellmeier.com/uploads/1/3/1/3/131380601/bojevedix_wudapatoboga_retosikepizi_goruku.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/11dca719-fb90-4e45-8586-20ef9ee6ca31/55851786243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df985229-201d-4ed7-9831-a16a5bfbc805/60268112587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b088779f-d5a1-472e-a9e7-d4983e41968b/15037045684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d6b86e-f522-4a70-84ce-de6f474d21ee/buzikapugaguxerowezufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea68351-ea81-467d-a851-5e83963f386b/pegagidigofomegejagokarej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/semi-_block_format_letter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/cot_sheet_nz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/40077718954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1051/2280/files/fepijatafagax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/58555456417.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_off00007b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B10 5364 bytes
SHA-256: 1b5c885e0f73a66bfb27fc18fd12e9b467e844e6bacf16caf8ebf7baa049b7b4
font_01_sfnt_off00008d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D30 10212 bytes
SHA-256: cea8e4bedc9d1376fec80f60bc480269993d2b397b040a7df8f699f4fa09cc4c

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