Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da8ea6c6cf4a429…

MALICIOUS

PDF

79.9 KB Created: 2020-11-08 01:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6c5c1e2612b234e10320bebfcf93b6cf SHA-1: c351824a8ed5748e5087569f58a5b29c2fa2b0df SHA-256: 6da8ea6c6cf4a4292b70e6f1a114bc856eed0c388f35a5e33181bca5fff7ba0d
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gettraff.ru/aws?keyword=nuremberg+trials+movie+documentary In PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/78f7b7ac897d.pdfIn PDF document text
    • https://ligenoleka.weebly.com/uploads/1/3/4/4/134496601/7121220.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/vokakuba_bapoja_fuvawezidor_lixolu.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/jajudavigiw.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/1632613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://danuxowifoka.files.wordpress.com/2020/11/81049847910.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/35905894654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb07d49-36ea-4d05-85a3-731ddd2626d3/pibixatawob.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00010a12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A12 17204 bytes
SHA-256: ab8f900158f2de09db7c8563686f6589e88bd2986b88f7c83b2e8f653449b30a
font_00_sfnt_off0000bc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC57 3836 bytes
SHA-256: 9c5b3fba82505cfe75b76a4d9e476324e09db789b38e591794c2c29a207a7398
font_01_sfnt_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 5412 bytes
SHA-256: cb8e09bfc87ed2b4525d3b5677440140007fdfabce8dd72e0111c2a9157c5eed
font_02_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 2176 bytes
SHA-256: 00cdd4d3dae107f37348c50f0b7ce93ed7905dfbf3d48762a9fa34618aacadb7
font_03_sfnt_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10672 bytes
SHA-256: 888fc76808563a6984ad30f29787c5f36eaa5b640b80b25a5194e1ab0f150d20
font_05_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f