Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0af172df3461c1b…

MALICIOUS

PDF

49.0 KB Created: 2020-10-12 21:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bfe9d1160d3eb400284c06284688b9bd SHA-1: 6d2fee2595dec83d615e0470b0860427855c2425 SHA-256: a0af172df3461c1b47c9f370d9b66455578e076d21f364daddea12aced070092
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same malicious URL and appears to be a lure related to accounting expenses. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=list+of+expenses+in+accounting+pdf In PDF document text
    • http://wolix.henkpeetersarchive.info/uploads/1/3/1/4/131438860/109307.pdfIn PDF document text
    • http://lujuwetoz.teachingwriting.co.uk/uploads/1/3/1/4/131483418/vajaragob.pdfIn PDF document text
    • http://files.thecometzone.com/uploads/1/3/1/6/131637014/vozoluximasax.pdfIn PDF document text
    • http://fuvilav.denisedaffara.com.au/uploads/1/3/1/0/131070302/558d51798b60.pdfIn PDF document text
    • https://site-1042737.mozfiles.com/files/1042737/kikagafitirevosowanusi.pdfIn PDF document text
    • https://site-1043564.mozfiles.com/files/1043564/notajir.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/13603415516.pdfIn PDF document text
    • https://site-1039378.mozfiles.com/files/1039378/xudawugina.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/1/0436/3649/0398/files/42178114273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7706/6145/files/stellaris_ruined_megastructures_id.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/92542074041.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5485/3027/files/inow_home_portal_wilcox_county.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1809/9094/files/kabanamojuwamawinanowotip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5409963-736e-4845-895f-3bda0532f1f7/80497240767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1050d0c6-9e1b-46a3-ad26-49cdf5dcb0ce/doxexixufonasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa912d3f-8f0c-4f9b-8c2d-8602bb913d94/noramevinosadetufas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ee7bf5-824d-469b-b5ec-d8dddb303b56/66112485833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a97f4f-f7bd-4a05-907b-a6681cd1e03b/pofonupigu.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_off00007fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FED 5204 bytes
SHA-256: af215d2173f3d84bf007f9c2063b40953f3dada10d775cc8a295ff93d111e797
font_01_sfnt_off000091bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91BC 10860 bytes
SHA-256: 04f28c5c500c11ea56e63c427a3d5e28f43da5eeb42eeba563fa98f533c66caa

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