Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc8a03bfb2ab7af…

MALICIOUS

PDF

68.6 KB Created: 2020-09-11 17:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c8f9e3d9d50000863f27eb675e329956 SHA-1: ccaa5cd1b76a24cb8a07df269ce04758962b5e68 SHA-256: 2cc8a03bfb2ab7af7cb84b38b50abbb8dbe7af16d3be30d8dd68bc024c36b7f0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed for malicious purposes. The primary redirector URL is `https://ttraff.cc/wix?keyword=prokaryotic+and+eukaryotic+worksheet+answers`, which is flagged as malicious. The document's content, presented as worksheet answers, is a lure to encourage users to click these links, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.cc/wix?keyword=prokaryotic+and+eukaryotic+worksheet+answers In PDF document text
    • http://files.backcourtballers.com/uploads/1/3/1/4/131483830/cb154c1f0ca93.pdfIn PDF document text
    • http://mapemijo.mts-wines.com/uploads/1/3/1/6/131637649/gunejofiralude.pdfIn PDF document text
    • http://files.amandatriplett.com/uploads/1/3/2/6/132681296/lanes_pateronuduxever_sugunutukaf.pdfIn PDF document text
    • http://mudeg.dongrigg.com/uploads/1/3/2/6/132695543/vosomujerewusupeg.pdfIn PDF document text
    • http://rasabeta.bhs-counseling.org/uploads/1/3/1/6/131637047/fabed385f8f.pdfIn PDF document text
    • http://files.karenfornes.com/uploads/1/3/0/7/130739810/9718655.pdfIn PDF document text
    • http://nawonew.a-1autoinc.com/uploads/1/3/1/4/131453724/sozavosijun-gizamugano-xaxusufuzevi.pdfIn PDF document text
    • http://files.soxoflove.org/uploads/1/3/0/7/130776781/92cb67265514.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/1/0435/8032/6051/files/98798349163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/31728228994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8185/8214/files/examen_psicometrico_laboral_con_respuestas.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0abb086997794cdb867f6fd60c66575f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/062c90_7b83d249922541bfbbc387320fa9041b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 5252 bytes
SHA-256: 80186ed86f8e35ce777bdee8cb78dc72f842217b814917c166fb09db9dd29e72
font_02_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 9876 bytes
SHA-256: ccdbf8562f166a30fef7b8e8dbf32e4f15f059f543dc29c1331456978cc76395

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