Malicious PDF — malware analysis report

Static analysis result for SHA-256 de856776882a365e…

MALICIOUS

PDF

64.8 KB Created: 2020-10-10 09:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2f12767048786b5960966cbeb442e47b SHA-1: ac61dfcddd6147ba256d05d6a36fc192d0115313 SHA-256: de856776882a365e586fdb6f1a4d6770624f18eec9d274164d0430210221d781
184 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to external content, likely to manipulate search engine rankings or distribute malicious payloads. The primary URL, 'https://ggtraff.ru/strik?keyword=ready+or+not+full+movie+online', is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of multiple disposable hosting links further supports this assessment.

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://ggtraff.ru/strik?keyword=ready+or+not+full+movie+online In PDF document text
    • https://site-1036689.mozfiles.com/files/1036689/14606970564.pdfIn PDF document text
    • https://site-1043289.mozfiles.com/files/1043289/xatununomegubedovijabik.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/30937923204.pdfIn PDF document text
    • https://site-1042670.mozfiles.com/files/1042670/rovepuwatuzakanevonis.pdfIn PDF document text
    • https://site-1041081.mozfiles.com/files/1041081/wakov.pdfIn PDF document text
    • http://files.fymandco.com/uploads/1/3/1/4/131483234/lufuniwofifikuxap.pdfIn PDF document text
    • http://files.calvarygo.org/uploads/1/3/2/6/132696465/vifowu_naziretuwewu_zojukelizo.pdfIn PDF document text
    • http://dekibi.lyannemarsh.com/uploads/1/3/0/8/130873843/8672e0d313327.pdfIn PDF document text
    • http://files.ducksnestdecoys.com/uploads/1/3/0/7/130775025/jiviwivapebe.pdfIn PDF document text
    • http://files.keganphotography.com/uploads/1/3/1/4/131454436/lixepud.pdfIn PDF document text
    • http://files.tomphillis.com/uploads/1/3/1/4/131407709/2ab38dd5d7130.pdfIn PDF document text
    • http://files.ballancricketclub.com/uploads/1/3/2/8/132815916/welobigeke-tedepo-wavifipuvam-mofevume.pdfIn PDF document text
    • http://files.topiaflow.com/uploads/1/3/0/7/130776077/6d5535ef1bb2ba.pdfIn PDF document text
    • http://files.daniellegaffen.com/uploads/1/3/0/8/130813887/4f954b.pdfIn PDF document text
    • http://files.nanticokeareametz.com/uploads/1/3/2/6/132682124/puvizebuwusoxalupe.pdfIn PDF document text
    • http://fiwamad.lavidspanish.com/uploads/1/3/0/9/130969060/tomel.pdfIn PDF document text
    • http://bemireba.kumbalekguitars.com/uploads/1/3/1/3/131379532/gatamazebaremivin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 5044 bytes
SHA-256: 5318c6b28a7a69ce8c837184eede181104e44723bd07edf562171c8d196a8b36
font_01_sfnt_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 10588 bytes
SHA-256: 3d8d2b75bde639a7ca8ed8c5c79a54eff948bb70448153a9b1621df25c622b9f

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